Review the problem statement from Codeforces (link will open a new tab). When you've matched your problem, go to the solutions.
Search on plain tags, ratings, names, and problem text. Example: brute force or binary search
Solved |
Name |
Tags |
Solutions |
Index |
Contest |
Type |
Points |
Tutorial |
Rating Level |
|---|---|---|---|---|---|---|---|---|---|
| 5446 | Two Paths | dfs and similar dp graphs shortest paths trees two pointers | Statement | D | Codeforces Beta Round 14 (Div. 2) {14} | PROGRAMMING | Codeforces Beta Round #14 tutorial | 2100 | |
| 865 | Caterpillar | dfs and similar dp graphs trees | Statement | F | Codeforces Beta Round 48 {51} | PROGRAMMING | 2600 | ||
| 1257 | Beavermuncher-0xFF | dfs and similar dp dsu greedy trees | Statement | C | Codeforces Beta Round 69 (Div. 1 Only) {77} | PROGRAMMING | Codeforces Beta Round #69 tutorial | 2300 | |
| 464 | Pairs | dfs and similar dp dsu graphs implementation trees | Statement | E | Yandex.Algorithm Open 2011: Qualification 1 {81} | PROGRAMMING | 2600 | ||
| 1107 | Beautiful Road | dfs and similar dp dsu graphs implementation sortings trees | Statement | D | Codeforces Beta Round 73 (Div. 1 Only) {87} | PROGRAMMING | CodeForces Beta Round #73 div. 1 analysis (particulary with div. 2) | 2300 | |
| 852 | Maze | dfs and similar dp probabilities trees | Statement | E | Codeforces Beta Round 92 (Div. 1 Only) {123} | PROGRAMMING | Codeforces Beta Round #92 - Analysis | 2600 | |
| 20459 | Distance in Tree | dfs and similar dp trees | Statement | D | VK Cup 2012 Round 1 {161} | PROGRAMMING | VK Cup 2012 Round 1: editorial | 1800 | |
| 2355 | e-Government | data structures dfs and similar dp strings trees | Statement | E | VK Cup 2012 Round 2 {163} | PROGRAMMING | VK Cup 2012 Round 2 — Разбор | 2800 | |
| 2380 | IT Restaurants | dfs and similar dp trees | Statement | E | VK Cup 2012 Finals (unofficial online-version) {212} | PROGRAMMING | 1800 | ||
| 13296 | Choosing Capital for Treeland | dfs and similar dp graphs trees | Statement | D | Codeforces Round 135 (Div. 2) {219} | PROGRAMMING | User editorial for Codeforces Round #135 (Div. 2) | 1900 | |
| 2405 | Cactus | data structures dfs and similar dp graphs trees | Statement | E | Codeforces Round 143 (Div. 2) {231} | PROGRAMMING | Tutorial Codeforces Round #143 | 2400 | |
| 1403 | World Eater Brothers | dfs and similar dp greedy trees | Statement | C | Codeforces Round 148 (Div. 1) {238} | PROGRAMMING | Editorial for Codeforces Round #148 | 2200 | |
| 211 | Tree and Table | dfs and similar dp implementation trees | Statement | E | Codeforces Round 153 (Div. 1) {251} | PROGRAMMING | Editorial of Codeforces Round #153 | 3000 | |
| 5827 | Zero Tree | dfs and similar dp greedy trees | Statement | B | Codeforces Round 168 (Div. 1) {274} | PROGRAMMING | Codeforces Round #168 Editorial | 2000 | |
| 7148 | Book of Evil | dfs and similar divide and conquer dp trees | Statement | D | Codeforces Round 196 (Div. 2) {337} | PROGRAMMING | Codeforces Round #196 — Problems Analysis | 2100 | |
| 653 | Pilgrims | dfs and similar dp trees | Statement | E | Codeforces Round 202 (Div. 1) {348} | PROGRAMMING | Editorial for Codeforces Round #202 | 2800 | |
| 7174 | A Lot of Games | dfs and similar dp games implementation strings trees | Statement | B | Codeforces Round 260 (Div. 1) {455} | PROGRAMMING | Codeforces Round #260 — Editorial | 2100 | |
| 6661 | Civilization | dfs and similar dp dsu ternary search trees | Statement | C | Codeforces Round 260 (Div. 1) {455} | PROGRAMMING | Codeforces Round #260 — Editorial | 2200 | |
| 7417 | Appleman and Tree | dfs and similar dp trees | Statement | B | Codeforces Round 263 (Div. 1) {461} | PROGRAMMING | Tutorial | 2200 | |
| 4452 | Valid Sets | dfs and similar dp math trees | Statement | D | Codeforces Round 277 (Div. 2) {486} | PROGRAMMING | Codeforces Round #277(Div. 2) Editorial | 2300 | |
| 1966 | Treeland Tour | data structures dfs and similar dp trees | Statement | F | Codeforces Round 279 (Div. 2) {490} | PROGRAMMING | Codeforces Round #279 (Div. 2) Editorial | 2500 | |
| 717 | Birthday | data structures dfs and similar dp trees | Statement | D | Codeforces Round 282 (Div. 1) {494} | PROGRAMMING | 15148 | 2700 | |
| 1591 | Drazil and Morning Exercise | dfs and similar dp dsu trees two pointers | Statement | D | Codeforces Round 292 (Div. 1) {516} | PROGRAMMING | 16468 | 2800 | |
| 9043 | A and B and Lecture Rooms | binary search data structures dfs and similar dp trees | Statement | E | Codeforces Round 294 (Div. 2) {519} | PROGRAMMING | 2300 | ||
| 19445 | Reposts | *special dfs and similar dp graphs trees | Statement | A | VK Cup 2015 - Qualification Round 1 {522} | PROGRAMMING | Разбор задач VK Cup 2015 — Квалификация 1 | 1700 | |
| 2734 | Work Group | dfs and similar dp graphs strings trees | Statement | B | VK Cup 2015 - Round 2 (unofficial online mirror, Div. 1 only) {533} | PROGRAMMING | 2000 | ||
| 1677 | Demiurges Play Again | dfs and similar dp math trees | Statement | E | Codeforces Round 300 {538} | PROGRAMMING | Codeforces Round #300 Editorial (+challenges) | 2200 | |
| 3031 | Super M | dfs and similar dp graphs trees | Statement | D | Codeforces Round 328 (Div. 2) {592} | PROGRAMMING | Codeforces Round #328 Problem Analysis | 2200 | |
| 4381 | Kingdom and its Cities | dfs and similar divide and conquer dp graphs sortings trees | Statement | D | Codeforces Round 339 (Div. 1) {613} | PROGRAMMING | Tutorial | 2800 | |
| 2062 | Hamiltonian Spanning Tree | dfs and similar dp graph matchings greedy trees | Statement | D | Wunder Fund Round 2016 (Div. 1 + Div. 2 combined) {618} | PROGRAMMING | Wunder Fund Round 2016 Editorials | 2200 | |
| 1040 | Preorder Test | binary search dfs and similar dp graphs greedy trees | Statement | D | 8VC Venture Cup 2016 - Final Round {627} | PROGRAMMING | 8VC Venture Cup 2016 — Final Round Editorial | 2600 | |
| 1211 | Famil Door and Roads | combinatorics data structures dfs and similar dp probabilities trees | Statement | E | Codeforces Round 343 (Div. 2) {629} | PROGRAMMING | Editorial of Codeforces Round #343 (Div.2) | 2400 | |
| 1458 | The Chocolate Spree | dfs and similar dp graphs trees | Statement | F | Manthan, Codefest 16 {633} | PROGRAMMING | Manthan, Codefest 16: Editorials | 2500 | |
| 8292 | Alyona and the Tree | dfs and similar dp graphs trees | Statement | C | Codeforces Round 358 (Div. 2) {682} | PROGRAMMING | 45491 | 1700 | |
| 5722 | Kay and Snowflake | data structures dfs and similar dp trees | Statement | B | Codeforces Round 359 (Div. 1) {685} | PROGRAMMING | Codeforces Round #359 Editorial | 2000 | |
| 4733 | Connecting Universities | dfs and similar dp graphs trees | Statement | B | Codeforces Round 364 (Div. 1) {700} | PROGRAMMING | 46283 | 2100 | |
| 4641 | Centroids | data structures dfs and similar dp graphs greedy trees | Statement | C | AIM Tech Round 3 (Div. 1) {708} | PROGRAMMING | Editorial | 2500 | |
| 5587 | Anton and Tree | dfs and similar dp trees | Statement | E | Codeforces Round 379 (Div. 2) {734} | PROGRAMMING | Tutorial of Codeforces Round #379 (Div. 2) | 2100 | |
| 4784 | Chloe and pleasant prizes | dfs and similar dp graphs trees | Statement | D | Codeforces Round 384 (Div. 2) {743} | PROGRAMMING | Codeforces Round #384 Editorial | 1800 | |
| 643 | Broken Tree | dfs and similar dp graphs greedy trees | Statement | E | Codeforces Round 392 (Div. 2) {758} | PROGRAMMING | Codeforces Round #392 (Div. 2) Editorial | 2900 | |
| 12339 | Timofey and a tree | dfs and similar dp dsu graphs implementation trees | Statement | A | Codeforces Round 395 (Div. 1) {763} | PROGRAMMING | Codeforces Round #395 [Editorial] | 1600 | |
| 1362 | Tree Folding | dfs and similar dp greedy implementation trees | Statement | E | Codeforces Round 397 by Kaspersky Lab and Barcelona Bootcamp (Div. 1 + Div. 2 combined) {765} | PROGRAMMING | Codeforces Round #397 Editorial | 2200 | |
| 3645 | Mahmoud and a xor trip | bitmasks constructive algorithms data structures dfs and similar dp math trees | Statement | E | Codeforces Round 396 (Div. 2) {766} | PROGRAMMING | Codeforces round #396 editorial | 2200 | |
| 3649 | Bear and Tree Jumps | dfs and similar dp trees | Statement | C | VK Cup 2017 - Round 1 {771} | PROGRAMMING | VK Cup 2017 Round 1 and CF Round 405 — Editorial | 2100 | |
| 336 | Problem of offices | constructive algorithms dfs and similar dp trees | Statement | E | Tinkoff Challenge - Elimination Round {793} | PROGRAMMING | 51685 | 2800 | |
| 7949 | Police Stations | constructive algorithms dfs and similar dp graphs shortest paths trees | Statement | D | Codeforces Round 408 (Div. 2) {796} | PROGRAMMING | Tutorial | 2100 | |
| 410 | Send the Fool Further! (hard) | dfs and similar dp math trees | Statement | J3 | Helvetic Coding Contest 2017 online mirror (teams allowed, unrated) {802} | PROGRAMMING | helvetic-coding-contest-2017-editorial.pdf | 2400 | |
| 364 | Send the Fool Further! (hard) | dfs and similar dp math trees | Statement | L | Helvetic Coding Contest 2017 online mirror (teams allowed, unrated) {802} | PROGRAMMING | helvetic-coding-contest-2017-editorial.pdf | 2800 | |
| 1651 | Expected diameter of a tree | binary search brute force dfs and similar dp sortings trees | Statement | D | Codeforces Round 411 (Div. 1) {804} | PROGRAMMING | Codeforces Round #411 Editorial | 2600 | |
| 2633 | An overnight dance in discotheque | dfs and similar dp geometry greedy trees | Statement | D | Codeforces Round 418 (Div. 2) {814} | PROGRAMMING | Codeforces Round #418 (Div. 2) Editorial | 2000 | |
| 1347 | Roads in the Kingdom | dfs and similar dp graphs trees | Statement | F | Codeforces Round 427 (Div. 2) {835} | PROGRAMMING | Editorial | 2400 | |
| 21191 | Journey | dfs and similar dp graphs probabilities trees | Statement | C | Codeforces Round 428 (Div. 2) {839} | PROGRAMMING | Codeforces Round #428 editorial | 1500 | |
| 458 | Harry Vs Voldemort | dfs and similar dp graphs trees | Statement | G | Manthan, Codefest 17 {855} | PROGRAMMING | 54750 | 3000 | |
| 488 | Sloth | dfs and similar dp graph matchings trees | Statement | D | Codeforces Round 446 (Div. 1) {891} | PROGRAMMING | Codeforces Round #446 Editorial | 3000 | |
| 1010 | Fafa and Ancient Mathematics | dfs and similar dp trees | Statement | E | Codeforces Round 465 (Div. 2) {935} | PROGRAMMING | editorial | 2500 | |
| 2373 | Alternating Tree | combinatorics dfs and similar divide and conquer dp probabilities trees | Statement | E | Divide by Zero 2018 and Codeforces Round 474 (Div. 1 + Div. 2, combined) {960} | PROGRAMMING | Divide by Zero 2018 and Codeforces Round #474 (Div. 1 + Div. 2, combined) Editorial | 2200 | |
| 3060 | Destruction of a Tree | constructive algorithms dfs and similar dp greedy trees | Statement | B | Tinkoff Internship Warmup Round 2018 and Codeforces Round 475 (Div. 1) {963} | PROGRAMMING | Editorial Tinkoff Internship Warmup Round 2018 and Codeforces Round #475 (Div. 1 + Div. 2) | 2100 | |
| 16964 | Cut 'em all! | dfs and similar dp graphs greedy trees | Statement | C | Codeforces Round 484 (Div. 2) {982} | PROGRAMMING | Editorial | 1500 | |
| 1149 | Flow Control | dfs and similar dp greedy trees | Statement | F | Educational Codeforces Round 45 (Rated for Div. 2) {990} | PROGRAMMING | Educational Codeforces Round 45 Editorial | 2500 | |
| 1099 | Road Projects | dfs and similar dp trees | Statement | F | Educational Codeforces Round 48 (Rated for Div. 2) {1016} | PROGRAMMING | Разбор Educational Codeforces Round 48 | 2600 | |
| 6859 | Decorate Apple Tree | constructive algorithms dfs and similar dp graphs greedy sortings trees | Statement | D | Mail.Ru Cup 2018 Round 3 {1056} | PROGRAMMING | Mail.Ru Cup 2018 Round 3 Editorial | 1600 | |
| 3579 | Sergey and Subway | dfs and similar dp trees | Statement | E | Codeforces Round 513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2) {1060} | PROGRAMMING | User editorial for Codeforces Round 513 by Barcelona Bootcamp (rated, Div. 1 + Div. 2) | 2000 | |
| 1413 | Up and Down the Tree | dfs and similar dp trees | Statement | F | Educational Codeforces Round 52 (Rated for Div. 2) {1065} | PROGRAMMING | Educational Codeforces Round 52 Editorial | 2500 | |
| 671 | Choosing Two Paths | dfs and similar dp greedy trees | Statement | F | Educational Codeforces Round 53 (Rated for Div. 2) {1073} | PROGRAMMING | 62742 | 2800 | |
| 11720 | Tree with Maximum Cost | dfs and similar dp trees | Statement | F | Codeforces Round 527 (Div. 3) {1092} | PROGRAMMING | Codeforces Round #527 (Div. 3) Editorial | 2100 | |
| 1088 | Cookies | binary search data structures dfs and similar dp games trees | Statement | F | Codeforces Round 530 (Div. 2) {1099} | PROGRAMMING | E | 2300 | |
| 5616 | GCD Counting | data structures dfs and similar dp number theory trees | Statement | D | Educational Codeforces Round 58 (Rated for Div. 2) {1101} | PROGRAMMING | 64483 | 2000 | |
| 1187 | Tree | data structures dfs and similar dp graphs trees | Statement | E | CodeCraft-19 and Codeforces Round 537 (Div. 2) {1111} | PROGRAMMING | CodeCraft-19 and Codeforces Round #537 (Div. 2) Editorial | 2800 | |
| 712 | Tree Cutting (Hard Version) | combinatorics dfs and similar dp trees | Statement | F2 | Codeforces Round 540 (Div. 3) {1118} | PROGRAMMING | 65396 | 2700 | |
| 1829 | Power Tree | dfs and similar dp dsu graphs greedy trees | Statement | D | Codeforces Round 543 (Div. 1, based on Technocup 2019 Final Round) {1120} | PROGRAMMING | Разбор задач финала Технокубка 2019 и Codeforces Round #543 | 2400 | |
| 4024 | Lynyrd Skynyrd | data structures dfs and similar dp math trees | Statement | B | Codeforces Round 549 (Div. 1) {1142} | PROGRAMMING | Codeforces Round #549 Editorial | 2300 | |
| 5693 | Serval and Rooted Tree | binary search dfs and similar dp greedy trees | Statement | D | Codeforces Round 551 (Div. 2) {1153} | PROGRAMMING | Editorial | 1800 | |
| 4926 | 0-1-Tree | dfs and similar divide and conquer dp dsu trees | Statement | D | Educational Codeforces Round 64 (Rated for Div. 2) {1156} | PROGRAMMING | 66827 | 2300 | |
| 4467 | Nauuo and Circle | combinatorics dfs and similar dp trees | Statement | B | Codeforces Round 564 (Div. 1) {1172} | PROGRAMMING | Codeforces Round #564 Editorial | 2000 | |
| 4821 | Minimal Segment Cover | data structures dfs and similar divide and conquer dp greedy implementation trees | Statement | E | Educational Codeforces Round 66 (Rated for Div. 2) {1175} | PROGRAMMING | Editorial | 2200 | |
| 1046 | Complete Mirror | constructive algorithms dfs and similar dp hashing implementation trees | Statement | D | Codeforces Round 566 (Div. 2) {1182} | PROGRAMMING | 67614 | 2500 | |
| 12113 | Tree Painting | dfs and similar dp trees | Statement | E | Educational Codeforces Round 67 (Rated for Div. 2) {1187} | PROGRAMMING | Разбор Educational Codeforces Round 67 | 2000 | |
| 3070 | Tourism | dfs and similar dp dsu graphs greedy trees | Statement | E | Codeforces Round 586 (Div. 1 + Div. 2) {1220} | PROGRAMMING | Codeforces Round #586 Editorial | 2200 | |
| 2246 | The Maximum Subtree | dfs and similar dp graphs trees | Statement | F | Educational Codeforces Round 74 (Rated for Div. 2) {1238} | PROGRAMMING | Educational Codeforces Round 74 Editorial | 2300 | |
| 985 | Economic Difficulties | data structures dfs and similar dp flows graphs trees | Statement | F | Codeforces Round 603 (Div. 2) {1263} | PROGRAMMING | Разбор Codeforces Round #603 (Div. 2) | 2500 | |
| 8812 | Dr. Evil Underscores | bitmasks brute force dfs and similar divide and conquer dp greedy strings trees | Statement | D | Codeforces Round 613 (Div. 2) {1285} | PROGRAMMING | Codeforces Round #613 (Div. 2) Editorial | 1800 | |
| 2412 | Xenon's Attack on the Gangs | combinatorics dfs and similar dp greedy trees | Statement | C | Codeforces Round 614 (Div. 1) {1292} | PROGRAMMING | 1250.0 | Codeforces Round #614 Editorial | 2300 |
| 7276 | Three Paths on a Tree | dfs and similar dp greedy trees | Statement | F | Codeforces Round 615 (Div. 3) {1294} | PROGRAMMING | Codeforces Round #615 (Div. 3) Editorial | 2100 | |
| 723 | Around the World | bitmasks combinatorics dfs and similar dp graphs graphs math trees | Statement | D | Codeforces Round 618 (Div. 1) {1299} | PROGRAMMING | 1750.0 | Codeforces Round #618 Editorial | 2900 |
| 13959 | Maximum White Subtree | dfs and similar dp graphs trees | Statement | F | Codeforces Round 627 (Div. 3) {1324} | PROGRAMMING | Codeforces Round #627 (Div. 3) Editorial | ||
| 1209 | Independent Set | dfs and similar dp trees | Statement | F | Codeforces Round 630 (Div. 2) {1332} | PROGRAMMING | 2250.0 | Codeforces Round #630 Editorial | 2500 |
| 25791 | Linova and Kingdom | dfs and similar dp greedy sortings trees | Statement | A | Codeforces Round 635 (Div. 1) {1336} | PROGRAMMING | 500.0 | Codeforces Round #635 Editorial | 1700 |
| 1165 | Nested Rubber Bands | dfs and similar dp trees | Statement | D | Codeforces Round 633 (Div. 1) {1338} | PROGRAMMING | 2000.0 | Editorial | |
| 7629 | Tree Shuffling | dfs and similar dp dsu greedy trees | Statement | E | Codeforces Round 646 (Div. 2) {1363} | PROGRAMMING | 2250.0 | 78202 | 2000 |
| 5181 | Ehab's Last Corollary | constructive algorithms data structures dfs and similar dp graphs implementation trees | Statement | D | Codeforces Round 649 (Div. 2) {1364} | PROGRAMMING | 2000.0 | Codeforces round #649 editorial | 2100 |
| 839 | The Majestic Brown Tree Snake | dfs and similar dp greedy trees two pointers | Statement | D | Codeforces Round 658 (Div. 1) {1381} | PROGRAMMING | 2500.0 | Codeforces Round #658 Editorial | 3000 |
| 10520 | Uncle Bogdan and Country Happiness | dfs and similar dp greedy math trees | Statement | C | Codeforces Round 660 (Div. 2) {1388} | PROGRAMMING | 1500.0 | Codeforces Round #660 Editorial | 1800 |
| 6997 | Captain Flint and Treasure | data structures dfs and similar dp graphs greedy implementation trees | Statement | D | Codeforces Round 660 (Div. 2) {1388} | PROGRAMMING | 2000.0 | Codeforces Round #660 Editorial | 2000 |
| 564 | Directing Edges | dfs and similar dp graphs greedy trees | Statement | G | Educational Codeforces Round 92 (Rated for Div. 2) {1389} | PROGRAMMING | 80809 | ||
| 271 | Star Trek | *special combinatorics dfs and similar dp games graphs matrices trees | Statement | C | Central-European Olympiad in Informatics, CEOI 2020, Day 1 (IOI, Unofficial Mirror Contest, Unrated) {1402} | PROGRAMMING | Editorial | ||
| 8397 | Tree Tag | dfs and similar dp games trees | Statement | B | Codeforces Round 668 (Div. 1) {1404} | PROGRAMMING | 1000.0 | Codeforces Round #668 Editorial | |
| 172 | Finding the Vertex | brute force dfs and similar dp interactive trees | Statement | E | Codeforces Round 680 (Div. 1, based on Moscow Team Olympiad) {1444} | PROGRAMMING | 3000.0 | Codeforces Round #680 Editorial | |
| 2267 | Dog Snacks | binary search dfs and similar dp greedy trees | Statement | E | Codeforces Round 688 (Div. 2) {1453} | PROGRAMMING | 2500.0 | Codeforces Round #688 (Div. 2) Editorial | |
| 1117 | Christmas Game | data structures dfs and similar dp games math trees | Statement | F | CodeCraft-21 and Codeforces Round 711 (Div. 2) {1498} | PROGRAMMING | 3000.0 | CodeCraft-21 and Codeforces Round #711 (Div. 2) Editorial | |
| 1717 | Diameter Cuts | dfs and similar dp trees | Statement | F | Educational Codeforces Round 106 (Rated for Div. 2) {1499} | PROGRAMMING | Educational Codeforces Round 106 Editorial | ||
| 2412 | Nastia Plays with a Tree | constructive algorithms data structures dfs and similar dp flows graphs greedy implementation trees | Statement | D | Codeforces Round 720 (Div. 2) {1521} | PROGRAMMING | 2250.0 | 90477 | |
| 20097 | Parsa's Humongous Tree | brute force dfs and similar dp greedy trees | Statement | A | Codeforces Round 722 (Div. 1) {1528} | PROGRAMMING | 750.0 | Codeforces Round #722 Editorial | |
| 3734 | How Many Paths? | dfs and similar dp graphs trees | Statement | G | Codeforces Round 731 (Div. 3) {1547} | PROGRAMMING | Codeforces Round #731 (Div. 3) Editorial | ||
| 2246 | Equidistant Vertices | combinatorics dfs and similar dp trees | Statement | F | Codeforces Round 734 (Div. 3) {1551} | PROGRAMMING | Editorial for Codeforces Round #734 (Div.3) | ||
| 9425 | Bakry and Partitioning | bitmasks constructive algorithms dfs and similar dp graphs trees | Statement | C | Codeforces Round 746 (Div. 2) {1592} | PROGRAMMING | 1500.0 | 95583 | |
| 4449 | Escape The Maze (hard version) | dfs and similar dp greedy shortest paths trees two pointers | Statement | E2 | Codeforces Round 756 (Div. 3) {1611} | PROGRAMMING | Tutorial | 2000 | |
| 1081 | Christmas Chocolates | dfs and similar dp games graphs implementation math number theory shortest paths trees | Statement | E | Codeforces Round 761 (Div. 2) {1617} | PROGRAMMING | 3000.0 | Editorial for Codeforces Round #761 (Div. 2) | |
| 1205 | Cats on the Upgrade (easy version) | data structures dfs and similar divide and conquer dp graphs trees | Statement | E1 | Codeforces Round 765 (Div. 2) {1625} | PROGRAMMING | 2000.0 | Editorial of Codeforces Round #765 (Div. 2) | |
| 2200 | Towers | constructive algorithms dfs and similar dp greedy trees | Statement | F | Codeforces Global Round 19 {1637} | PROGRAMMING | 3250.0 | Tutorial | |
| 4521 | Weight the Tree | constructive algorithms dfs and similar dp implementation trees | Statement | D | Codeforces Round 774 (Div. 2) {1646} | PROGRAMMING | 2000.0 | Codeforces Round #774 (Div. 2) Editorial | 2000 |
| 884 | Edge Elimination | constructive algorithms dfs and similar dp trees | Statement | D | Codeforces Round 783 (Div. 1) {1667} | PROGRAMMING | 2000.0 | Codeforces Round #783 Editorial | 2900 |
| 6425 | Vlad and Unfinished Business | dfs and similar dp greedy trees | Statement | F | Codeforces Round 787 (Div. 3) {1675} | PROGRAMMING | 102550 | ||
| 26390 | White-Black Balanced Subtrees | dfs and similar dp graphs trees | Statement | G | Codeforces Round 790 (Div. 4) {1676} | PROGRAMMING | Codeforces Round #790 (Div. 4) Editorial | ||
| 2479 | Unique Occurrences | data structures dfs and similar divide and conquer dp dsu trees | Statement | F | Educational Codeforces Round 129 (Rated for Div. 2) {1681} | PROGRAMMING | 103163 | 2300 | |
| 14070 | Infected Tree | constructive algorithms dfs and similar dp greedy trees | Statement | C | Codeforces Round 798 (Div. 2) {1689} | PROGRAMMING | 1250.0 | Editorial for Codeforces Round #798 (Div. 2) | |
| 1196 | K-Set Tree | combinatorics dfs and similar dp math trees | Statement | F | CodeCraft-22 and Codeforces Round 795 (Div. 2) {1691} | PROGRAMMING | 2750.0 | Editorial for CodeCraft-22 and Codeforces Round #795 (Div. 2) | |
| 9770 | Fake Plastic Trees | dfs and similar dp greedy trees | Statement | B | Codeforces Round 800 (Div. 1) {1693} | PROGRAMMING | 1000.0 | Codeforces Round #800 Editorial | 1700 |
| 2507 | Tree Queries (Easy Version) | constructive algorithms dfs and similar dp greedy trees | Statement | D1 | Codeforces Round 801 (Div. 2) and EPIC Institute of Technology Round {1695} | PROGRAMMING | 1250.0 | Editorial for Codeforces Round #801 (Div. 2) and EPIC Institute of Technology Round | |
| 2342 | Tree Queries (Hard Version) | constructive algorithms dfs and similar dp greedy trees | Statement | D2 | Codeforces Round 801 (Div. 2) and EPIC Institute of Technology Round {1695} | PROGRAMMING | 1000.0 | Editorial for Codeforces Round #801 (Div. 2) and EPIC Institute of Technology Round | |
| 6257 | Passable Paths (hard version) | bitmasks data structures dfs and similar dp sortings trees | Statement | G2 | Codeforces Round 805 (Div. 3) {1702} | PROGRAMMING | 104763 | ||
| 5161 | Hanging Hearts | constructive algorithms data structures dfs and similar dp greedy trees | Statement | E | Codeforces Round 831 (Div. 1 + Div. 2) {1740} | PROGRAMMING | 2000.0 | Tutorial | 1800 |
| 5190 | Paths on the Tree | dfs and similar dp greedy sortings trees | Statement | D | Codeforces Global Round 23 {1746} | PROGRAMMING | 1500.0 | Codeforces Global Round 23 Editorial | |
| 3320 | Hossam and (sub-)palindromic tree | brute force dfs and similar dp trees | Statement | D | Codeforces Round 837 (Div. 2) {1771} | PROGRAMMING | 2250.0 | Codeforces Round #837 (Div. 2) Editorial | |
| 4036 | Two Chess Pieces | dfs and similar dp greedy trees | Statement | E | Polynomial Round 2022 (Div. 1 + Div. 2, Rated, Prizes!) {1774} | PROGRAMMING | 2000.0 | Polynomial Round 2022 (Div. 1 + Div. 2) Editorial | |
| 4965 | Score of a Tree | bitmasks combinatorics dfs and similar dp probabilities trees | Statement | D | Codeforces Round 845 (Div. 2) and ByteRace 2023 {1777} | PROGRAMMING | 2000.0 | Codeforces Round #845 (Div. 2) and ByteRace 2023 Editorial | |
| 981 | Maximizing Root | dfs and similar dp graphs math trees | Statement | F | Codeforces Round 848 (Div. 2) {1778} | PROGRAMMING | 2750.0 | Codeforces Round #848 (Div. 2) Editorial | |
| 4728 | Li Hua and Tree | brute force data structures dfs and similar dp implementation trees | Statement | D | Codeforces Round 864 (Div. 2) {1797} | PROGRAMMING | 1750.0 | Codeforces Round 864 (Div. 2) Editorial | |
| 9783 | A Wide, Wide Graph | dfs and similar dp dsu greedy trees | Statement | D | Codeforces Round 862 (Div. 2) {1805} | PROGRAMMING | 1750.0 | Editorial of Codeforces Round #862 (Div. 2) | |
| 7910 | Gardening Friends | brute force dfs and similar dp graphs trees | Statement | F | Codeforces Round 867 (Div. 3) {1822} | PROGRAMMING | Codeforces Round #867 (Div. 3) Editorial | ||
| 1753 | LuoTianyi and XOR-Tree | data structures dfs and similar dp dsu greedy trees | Statement | C | Codeforces Round 872 (Div. 1) {1824} | PROGRAMMING | 1750.0 | CodeForces Round 872(Div. 1&2) Editorial | 2500 |
| 21744 | Copil Copac Draws Trees | dfs and similar dp graphs trees | Statement | A | Codeforces Round 875 (Div. 1) {1830} | PROGRAMMING | 500.0 | Codeforces Round #875 (Div.1 + Div. 2) Editorial | |
| 6596 | Ksyusha and Chinchilla | dfs and similar dp dsu greedy implementation trees | Statement | G | Codeforces Round 874 (Div. 3) {1833} | PROGRAMMING | 116636 | ||
| 22466 | Apple Tree | combinatorics dfs and similar dp trees | Statement | D | Codeforces Round 881 (Div. 3) {1843} | PROGRAMMING | Codeforces Round #881 (Div. 3) Editorial | ||
| 2261 | Omsk Metro (hard version) | data structures dfs and similar divide and conquer dp implementation math trees | Statement | F2 | Codeforces Round 881 (Div. 3) {1843} | PROGRAMMING | Codeforces Round #881 (Div. 3) Editorial | ||
| 6514 | Omsk Metro (simple version) | data structures dfs and similar dp greedy math trees | Statement | F1 | Codeforces Round 881 (Div. 3) {1843} | PROGRAMMING | Codeforces Round #881 (Div. 3) Editorial | ||
| 6634 | PermuTree (easy version) | dfs and similar dp trees | Statement | E1 | Codeforces Round 890 (Div. 2) supported by Constructor Institute {1856} | PROGRAMMING | 1500.0 | Codeforces Round #890 (Div. 2) Editorial | |
| 2851 | Autosynthesis | 2-sat constructive algorithms dfs and similar dp flows graphs trees | Statement | C | Codeforces Round 902 (Div. 1, based on COMPFEST 15 - Final Round) {1876} | PROGRAMMING | 1250.0 | Codeforces Round #902 (Div. 1, Div. 2, based on COMPFEST 15 — Final Round) Editorial | |
| 10099 | Minimum Maximum Distance | dfs and similar dp graphs shortest paths trees | Statement | F | Codeforces Round 903 (Div. 3) {1881} | PROGRAMMING | 121327 | ||
| 7400 | Tree XOR | bitmasks dfs and similar dp greedy trees | Statement | D | Codeforces Round 899 (Div. 2) {1882} | PROGRAMMING | 2000.0 | Codeforces Round 899 (Div. 2) Editorial | |
| 15465 | Anji's Binary Tree | dfs and similar dp shortest paths trees | Statement | C | Codeforces Round 911 (Div. 2) {1900} | PROGRAMMING | 1250.0 | Codeforces Round 911 (Div. 2) Editorial | |
| 2055 | Compressed Tree | dfs and similar dp graphs greedy trees | Statement | E | Educational Codeforces Round 158 (Rated for Div. 2) {1901} | PROGRAMMING | Educational Codeforces Round 158 Editorial | ||
| 2757 | Happy Life in University | brute force data structures dfs and similar dp implementation trees | Statement | E | Good Bye 2023 {1916} | PROGRAMMING | 2000.0 | ||
| 5426 | Count Paths | data structures dfs and similar divide and conquer dp dsu trees | Statement | E | Educational Codeforces Round 162 (Rated for Div. 2) {1923} | PROGRAMMING | Educational Codeforces Round 162 Editorial | ||
| 4699 | Vlad and Trouble at MIT | dfs and similar dp flows graphs greedy implementation trees | Statement | G | Codeforces Round 928 (Div. 4) {1926} | PROGRAMMING | 126132 | ||
| 5956 | Sasha and a Walk in the City | combinatorics dfs and similar dp math trees | Statement | D | Codeforces Round 926 (Div. 2) {1929} | PROGRAMMING | 2000.0 | Codeforces Round #926 (Div. 2) Editorial. | |
| 4590 | Game on Tree (Medium) | dfs and similar dp games trees | Statement | C2 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 1700 | |
| 2566 | Game on Tree (Hard) | dfs and similar dp games trees | Statement | C3 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 1900 | |
| 919 | Min-Fund Prison (Medium) | brute force dfs and similar dp graphs trees | Statement | G2 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 2200 | |
| 579 | Min-Fund Prison (Hard) | bitmasks dfs and similar dp graphs trees | Statement | G3 | Helvetic Coding Contest 2024 online mirror (teams allowed, unrated) {1970} | PROGRAMMING | Helvetic Coding Contest 2024 Editorial | 2400 | |
| 7702 | Paint the Tree | brute force dfs and similar dp greedy shortest paths trees | Statement | D | Codeforces Round 947 (Div. 1 + Div. 2) {1975} | PROGRAMMING | 1500.0 | editorial_zh.pdf | 1700 |
| 1033 | Remove Bridges | data structures dfs and similar dp greedy sortings trees | Statement | F | Educational Codeforces Round 166 (Rated for Div. 2) {1976} | PROGRAMMING | Educational Codeforces Round 166 Editorial | ||
| 4183 | Wonderful Tree! | brute force dfs and similar dp flows greedy trees | Statement | E | EPIC Institute of Technology Round Summer 2024 (Div. 1 + Div. 2) {1987} | PROGRAMMING | 1750.0 | EPIC Institute of Technology Round Summer 2024 (Div. 1 + Div. 2) Editorial | |
| 16461 | Maximize the Root | binary search dfs and similar dp greedy trees | Statement | D | Educational Codeforces Round 168 (Rated for Div. 2) {1997} | PROGRAMMING | Video Tutorial | ||
| 5488 | Sheriff's Defense | dfs and similar dp trees | Statement | F | Codeforces Round 974 (Div. 3) {2014} | PROGRAMMING | Discussion stream (With Hints) | ||
| 7631 | Connect the Dots | brute force dfs and similar dp dsu graphs math trees | Statement | D | Codeforces Round 976 (Div. 2) and Divide By Zero 9.0 {2020} | PROGRAMMING | 1500.0 | Tutorial for Codeforces Round 976 (Div. 2) and Divide By Zero 9.0 | |
| 1092 | Choose Your Queries | dfs and similar dp graphs greedy trees | Statement | F | Educational Codeforces Round 170 (Rated for Div. 2) {2025} | PROGRAMMING | Educational Codeforces Round 170 Editorial | ||
| 424 | Bermart Ice Cream | data structures dfs and similar divide and conquer dp implementation trees | Statement | F | Educational Codeforces Round 171 (Rated for Div. 2) {2026} | PROGRAMMING | Educational Codeforces Round 171 Editorial | ||
| 2009 | Alice's Adventures in the Rabbit Hole | constructive algorithms dfs and similar dp greedy math probabilities trees | Statement | E | Codeforces Round 986 (Div. 2) {2028} | PROGRAMMING | 2000.0 | Codeforces Round 986 (Div. 2) Editorial | |
| 10206 | Penchick and Desert Rabbit | data structures dfs and similar dp dsu greedy two pointers | Statement | D | Codeforces Round 987 (Div. 2) {2031} | PROGRAMMING | 2000.0 | Codeforces Round 987 (Div. 2) Editorial | |
| 2777 | Penchick and Chloe's Trees | data structures dfs and similar dp greedy sortings trees | Statement | E | Codeforces Round 987 (Div. 2) {2031} | PROGRAMMING | 2500.0 | Codeforces Round 987 (Div. 2) Editorial | |
| 2078 | Sakurako and Chefir | data structures dfs and similar dp trees | Statement | G | Codeforces Round 981 (Div. 3) {2033} | PROGRAMMING | 135520 | ||
| 1132 | Tree Operations | binary search dfs and similar dp trees | Statement | F | Codeforces Global Round 27 {2035} | PROGRAMMING | 2250.0 | Codeforces Global Round 27 Editorial | |
| 545 | Vertex Pairs | binary search brute force dfs and similar dp greedy trees | Statement | E | Educational Codeforces Round 172 (Rated for Div. 2) {2042} | PROGRAMMING | 136886 | ||
| 4065 | Medium Demon Problem (hard version) | dfs and similar dp dsu graphs implementation trees | Statement | G2 | Codeforces Round 993 (Div. 4) {2044} | PROGRAMMING | Codeforces Round 993 (Div. 4) Editorial | ||
| 5625 | Tree Destruction | dfs and similar dp greedy trees | Statement | G | Codeforces Round 991 (Div. 3) {2050} | PROGRAMMING | Разбор Codeforces Round 991 (Div. 3) | ||
| 4608 | Resourceful Caterpillar Sequence | dfs and similar dp games graphs implementation trees | Statement | E | Good Bye 2024: 2025 is NEAR {2053} | PROGRAMMING | 2000.0 | Good Bye 2024: 2025 is NEAR Editorial | |
| 3657 | Balanced Tree | dfs and similar dp greedy trees | Statement | D | Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2) {2062} | PROGRAMMING | 2000.0 | Ethflow Round 1 (Codeforces Round 1001, Div. 1 + Div. 2) Editorial | |
| 2440 | Triangle Tree | data structures dfs and similar dp dsu greedy trees | Statement | E | Codeforces Round 1000 (Div. 2) {2063} | PROGRAMMING | 2750.0 | Codeforces Round 1000 (Div. 2) — Editorial | |
| 11657 | Tree Jumps | combinatorics dfs and similar dp trees | Statement | D | Educational Codeforces Round 175 (Rated for Div. 2) {2070} | PROGRAMMING | Video Tutorial | ||
| 9850 | Reachability and Tree | constructive algorithms dfs and similar dp trees | Statement | D | Educational Codeforces Round 180 (Rated for Div. 2) {2112} | PROGRAMMING | Educational Codeforces Round 180 — Editorial | ||
| 14566 | Kirei Attacks the Estate | dfs and similar dp trees | Statement | E | Codeforces Round 1027 (Div. 3) {2114} | PROGRAMMING | 143268 | ||
| 2690 | 23 Rises Again | brute force data structures dfs and similar dp flows graphs implementation probabilities trees | Statement | H | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 4000.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 3612 | Maple and Tree Beauty (Hard Version) | bitmasks brute force dfs and similar divide and conquer dp fft trees | Statement | C2 | Codeforces Round 1048 (Div. 1) {2138} | PROGRAMMING | 750.0 | Codeforces Round 1048 (Div. 1, Div. 2) Editorial | |
| 5753 | Maple and Tree Beauty (Easy Version) | dfs and similar dp graphs trees | Statement | C1 | Codeforces Round 1048 (Div. 1) {2138} | PROGRAMMING | 1250.0 | Codeforces Round 1048 (Div. 1, Div. 2) Editorial | |
| 4367 | Cherry Tree | dfs and similar dp graphs trees | Statement | F | Codeforces Round 1072 (Div. 3) {2184} | PROGRAMMING | Codeforces Round 1072 (Div. 3) Editorial | ||
| 4030 | Cost of Tree | data structures dfs and similar dp trees | Statement | D | Codeforces Round 1081 (Div. 2) {2192} | PROGRAMMING | 1750.0 | Codeforces Round 1081 (Div. 2) Editorial | |
| 1168 | Remove the Grail Tree | dfs and similar dp greedy trees | Statement | H | Codeforces Round 1076 (Div. 3) {2193} | PROGRAMMING | Разбор Codeforces Round 1076 (Div. 3) | ||
| 233 | Again Trees... (hard version) | bitmasks data structures dfs and similar dp fft trees | Statement | F2 | Codeforces Round 1078 (Div. 2) {2194} | PROGRAMMING | 1750.0 | Codeforces Round #1078 Editorial | |
| 999 | Again Trees... (Easy Version) | bitmasks dfs and similar dp fft trees | Statement | F1 | Codeforces Round 1078 (Div. 2) {2194} | PROGRAMMING | 1750.0 | Codeforces Round #1078 Editorial | |
| 9665 | Idiot First Search | dfs and similar dp trees | Statement | E | Codeforces Round 1080 (Div. 3) {2195} | PROGRAMMING | Codeforces Round 1080 (Div. 3) Editorial | ||
| 2333 | Boxed Like a Fish | dfs and similar dp games trees | Statement | D | Codeforces Round 1085 (Div. 1 + Div. 2) {2207} | PROGRAMMING | 2250.0 | Codeforces Round 1085 (Div. 1 + Div. 2) Editorial | |
| 1751 | Fallen Leaves | dfs and similar dp trees | Statement | H | Codeforces Round 1096 (Div. 3) {2227} | PROGRAMMING | Codeforces Round 1096 (Div. 3) — Editorial | ||
| 357 | Momoyo and the Network | binary search dfs and similar divide and conquer dp trees | Statement | F | Codeforces Round 1098 (Div. 2) {2228} | PROGRAMMING | 3500.0 | Codeforces Round 1098 (Div. 2) Editorial | |
| 524 | Game on Growing Tree | binary search dfs and similar dp games trees | Statement | F | Educational Codeforces Round 190 (Rated for Div. 2) {2230} | PROGRAMMING | Educational Codeforces Round 190 — Editorial | ||
| 1191 | Graph Cutting | dfs and similar dp trees | Statement | E | Codeforces Round 1099 (Div. 2) {2231} | PROGRAMMING | 2500.0 | ||
| 9356 | Village Guilds | dfs and similar dp trees | Statement | C | Codeforces Round 1106 (Div. 2) {2238} | PROGRAMMING | 1250.0 | Codeforces Round 1106 (Div. 2) Editorial | |
| 402 | Spectral Components | dfs and similar dp greedy sortings trees | Statement | F | Codeforces Round 1115 (Div. 2) {2252} | PROGRAMMING | 2750.0 | 155741 | |
| 1048 | Nightcrawler | data structures dfs and similar dp greedy sortings trees | Statement | G | Codeforces Round 1114 (Div. 3) {2254} | PROGRAMMING | Tutorial | ||
| 83 | Plus Minus Tree | dfs and similar dp graphs trees | Statement | F | Codeforces Round 1118 (Div. 2) {2258} | PROGRAMMING | 3000.0 | Codeforces Round 1118 (Div. 2) Editorial |