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 |
|---|---|---|---|---|---|---|---|---|---|
| 95160 | T-primes | binary search implementation math number theory | Statement | B | Codeforces Round 142 (Div. 2) {230} | PROGRAMMING | Codeforces Round #142 Problem Analysis | 1300 | |
| 2173 | Mr. Bender and Square | binary search implementation math | Statement | D | Codeforces Round 156 (Div. 2) {255} | PROGRAMMING | Codeforces Round #156 tutorial | 1900 | |
| 3893 | Ciel and Robot | binary search implementation math | Statement | A | Codeforces Round 190 (Div. 1) {321} | PROGRAMMING | Codeforces Round #190 — Editorial | 1700 | |
| 2784 | Making Sequences is Fun | binary search implementation math | Statement | B | Codeforces Round 219 (Div. 2) {373} | PROGRAMMING | Codeforces Round #219 editorial | 1600 | |
| 10545 | Bear and Prime Numbers | binary search brute force data structures dp implementation math number theory | Statement | C | Codeforces Round 226 (Div. 2) {385} | PROGRAMMING | Codeforces Round #226 (Div. 2) — Editorial | 1800 | |
| 6683 | Mashmokh and Tokens | binary search greedy implementation math | Statement | B | Codeforces Round 240 (Div. 2) {415} | PROGRAMMING | Codeforces Round #240 Editorial | 1500 | |
| 89767 | Vanya and Lanterns | binary search implementation math sortings | Statement | B | Codeforces Round 280 (Div. 2) {492} | PROGRAMMING | Разбор задач | 1200 | |
| 3317 | Vanya and Computer Game | binary search implementation math sortings | Statement | D | Codeforces Round 280 (Div. 2) {492} | PROGRAMMING | Разбор задач | 1800 | |
| 6126 | Tourist's Notes | binary search brute force greedy implementation math | Statement | C | Codeforces Round 300 {538} | PROGRAMMING | Codeforces Round #300 Editorial (+challenges) | 1600 | |
| 2263 | Kyoya and Permutation | binary search combinatorics constructive algorithms greedy implementation math | Statement | B | Codeforces Round 309 (Div. 1) {553} | PROGRAMMING | Codeforces Round #309 Editorial | 2200 | |
| 930 | Case of a Top Secret | binary search implementation math | Statement | D | Codeforces Round 310 (Div. 1) {555} | PROGRAMMING | Codeforces Round #310 Editorial | 2500 | |
| 1060 | Hexagons | binary search implementation math | Statement | E | Codeforces Round 338 (Div. 2) {615} | PROGRAMMING | Codeforces Round #338 (Div. 2) editorial | 2200 | |
| 10157 | Sanatorium | binary search constructive algorithms greedy implementation math | Statement | C | Codeforces Round 377 (Div. 2) {732} | PROGRAMMING | Codeforces Round #377 (Div. 2) Editorial | 1300 | |
| 92149 | New Year and Hurry | binary search brute force implementation math | Statement | A | Good Bye 2016 {750} | PROGRAMMING | Good Bye 2016 — hints and codes | 800 | |
| 4050 | Unfair Poll | binary search constructive algorithms implementation math | Statement | C | Codeforces Round 392 (Div. 2) {758} | PROGRAMMING | Codeforces Round #392 (Div. 2) Editorial | 1700 | |
| 6237 | Molly's Chemicals | binary search brute force data structures implementation math | Statement | C | ICM Technex 2017 and Codeforces Round 400 (Div. 1 + Div. 2, combined) {776} | PROGRAMMING | ICM Technex 2017 and Codeforces Round #400 (Div. 1 + Div. 2, combined) Editorial | 1800 | |
| 479 | Strange Radiation | binary search implementation math | Statement | C | Codeforces Round 425 (Div. 2) {832} | PROGRAMMING | Codeforces Round #425 (Div.2) Editorial | 2500 | |
| 2057 | Vasya's Function | binary search implementation math | Statement | E | Educational Codeforces Round 26 {837} | PROGRAMMING | 53662 | 2200 | |
| 4635 | Save Energy! | binary search implementation math | Statement | A | Codeforces Round 467 (Div. 1) {936} | PROGRAMMING | Codeforces Round #467, Editorial | 1700 | |
| 1086 | New Year and the Acquaintance Estimation | binary search data structures graphs greedy implementation math sortings | Statement | E | Good Bye 2018 {1091} | PROGRAMMING | Editorial | 2400 | |
| 273 | Fedya the Potter | binary search implementation math number theory | Statement | E | Codeforces Round 530 (Div. 1) {1098} | PROGRAMMING | 64331 | 3400 | |
| 8308 | The Party and Sweets | binary search constructive algorithms greedy implementation math sortings two pointers | Statement | A | Codeforces Round 559 (Div. 1) {1158} | PROGRAMMING | 66993 | 1500 | |
| 2444 | Serge and Dining Room | binary search data structures graph matchings greedy implementation math trees | Statement | C | Codeforces Round 569 (Div. 1) {1179} | PROGRAMMING | Editorial of Round #569 | 2400 | |
| 540 | You Are Given Some Letters... | binary search implementation math | Statement | F | Educational Codeforces Round 70 (Rated for Div. 2) {1202} | PROGRAMMING | 68972 | 2800 | |
| 1362 | Cow and Treats | binary search combinatorics dp greedy implementation math | Statement | E | Codeforces Round 621 (Div. 1 + Div. 2) {1307} | PROGRAMMING | 2500.0 | Codeforces Round #621 (Div. 1 + Div. 2) Editorial | 2400 |
| 7006 | Different Rules | binary search constructive algorithms greedy implementation math | Statement | B | Codeforces Round 622 (Div. 2) {1313} | PROGRAMMING | 1000.0 | Editorial | 1700 |
| 11912 | Count Triangles | binary search implementation math two pointers | Statement | C | Codeforces Round 643 (Div. 2) {1355} | PROGRAMMING | 1250.0 | Codeforces Round #643 (Div. 2) Editorial | 1800 |
| 4405 | Guess The Maximums | binary search divide and conquer implementation interactive math | Statement | D | Codeforces Round 646 (Div. 2) {1363} | PROGRAMMING | 2000.0 | 78202 | 2100 |
| 19332 | Pluses and Minuses | binary search dp greedy implementation math | Statement | C | Educational Codeforces Round 90 (Rated for Div. 2) {1373} | PROGRAMMING | Educational Codeforces Round 90 Editorial | ||
| 4546 | Segment Intersections | binary search brute force greedy implementation math | Statement | D | Educational Codeforces Round 92 (Rated for Div. 2) {1389} | PROGRAMMING | 80809 | ||
| 2592 | Two Types of Spells | binary search data structures greedy implementation math sortings | Statement | E | Educational Codeforces Round 93 (Rated for Div. 2) {1398} | PROGRAMMING | Educational Codeforces Round 93 Editorial | ||
| 9264 | Discrete Acceleration | binary search implementation math two pointers | Statement | C | Grakn Forces 2020 {1408} | PROGRAMMING | 1250.0 | Grakn Forces -- Editorial | |
| 10169 | Divide and Summarize | binary search brute force data structures divide and conquer implementation sortings | Statement | D | Codeforces Round 689 (Div. 2, based on Zed Code Competition) {1461} | PROGRAMMING | 1500.0 | Codeforces Round #689 (Div. 2). Editorial | |
| 11337 | Close Tuples (hard version) | binary search combinatorics implementation math sortings two pointers | Statement | E2 | Codeforces Round 690 (Div. 3) {1462} | PROGRAMMING | Codeforces Round #690 (Div. 3) Editorial | ||
| 4414 | Almost Sorted | binary search bitmasks combinatorics constructive algorithms dp implementation math | Statement | B | Codeforces Round 715 (Div. 1) {1508} | PROGRAMMING | 1000.0 | Codeforces Round #715 Editorial | |
| 6802 | Education | binary search greedy implementation math | Statement | F | Codeforces Round 713 (Div. 3) {1512} | PROGRAMMING | Codeforces Round #713 (Div. 3) Editorial | ||
| 5337 | Array Stabilization (AND version) | binary search brute force graphs greedy implementation math number theory shortest paths | Statement | F | Codeforces Round 744 (Div. 3) {1579} | PROGRAMMING | Codeforces Round #744 (Div. 3) Editorial | ||
| 1181 | Array Equalizer | binary search implementation math number theory sortings | Statement | E | Codeforces Round 754 (Div. 2) {1605} | PROGRAMMING | 2500.0 | tutorial | 2400 |
| 1736 | Spanning Tree Queries | binary search data structures dsu graphs implementation math sortings | Statement | E | Educational Codeforces Round 122 (Rated for Div. 2) {1633} | PROGRAMMING | 99539 | ||
| 4457 | Rescheduling the Exam | binary search data structures greedy implementation math sortings | Statement | E | Codeforces Round 776 (Div. 3) {1650} | PROGRAMMING | 100712 | ||
| 11426 | Maximum Product Strikes Back | binary search implementation math | Statement | D | Codeforces Round 780 (Div. 3) {1660} | PROGRAMMING | Codeforces Round #780 (Div. 3) Editorial | ||
| 5599 | Very Suspicious | binary search brute force geometry implementation math | Statement | D | Codeforces Round 788 (Div. 2) {1670} | PROGRAMMING | 2250.0 | Tutorial | 1700 |
| 731 | Cute number | binary search brute force implementation math | Statement | D | Codeforces Round 796 (Div. 1) {1687} | PROGRAMMING | 1500.0 | Editorial of Codeforces Round 796 | |
| 17163 | Meeting on the Line | binary search greedy implementation math ternary search | Statement | B | Codeforces Round 823 (Div. 2) {1730} | PROGRAMMING | 1000.0 | Codeforces Round #823 — editorial | 1600 |
| 10163 | Ela's Fitness and the Luxury Number | binary search implementation math | Statement | B | Dytechlab Cup 2022 {1737} | PROGRAMMING | 1000.0 | Editorial of Dytechlab Cup 2022 | |
| 16582 | Interview | binary search implementation interactive | Statement | E | Codeforces Round 859 (Div. 4) {1807} | PROGRAMMING | 114143 | ||
| 1066 | Two Tanks | binary search dp implementation math | Statement | E | Educational Codeforces Round 145 (Rated for Div. 2) {1809} | PROGRAMMING | 114300 | ||
| 3372 | Red-Blue Operations (Easy Version) | binary search greedy implementation math | Statement | D1 | Educational Codeforces Round 148 (Rated for Div. 2) {1832} | PROGRAMMING | 116454 | 2100 | |
| 2332 | Red-Blue Operations (Hard Version) | binary search constructive algorithms greedy implementation math | Statement | D2 | Educational Codeforces Round 148 (Rated for Div. 2) {1832} | PROGRAMMING | 116454 | 2400 | |
| 2761 | MEX of LCM | binary search brute force data structures implementation math number theory two pointers | Statement | E | Codeforces Round 879 (Div. 2) {1834} | PROGRAMMING | 2500.0 | Codeforces Round #879 Editorial | |
| 25022 | Rudolf and Snowflakes (simple version) | binary search brute force implementation math | Statement | E1 | Codeforces Round 883 (Div. 3) {1846} | PROGRAMMING | |||
| 8480 | Rudolf and Snowflakes (hard version) | binary search brute force implementation math | Statement | E2 | Codeforces Round 883 (Div. 3) {1846} | PROGRAMMING | |||
| 24201 | Vika and the Bridge | binary search data structures greedy implementation math sortings | Statement | B | Codeforces Round 885 (Div. 2) {1848} | PROGRAMMING | 1000.0 | Codeforces Round #885 (Div.2) Editorial | |
| 34755 | Cardboard for Pictures | binary search geometry implementation math | Statement | E | Codeforces Round 886 (Div. 4) {1850} | PROGRAMMING | Codeforces Round #886 (Div. 4) Editorial | ||
| 9207 | Ntarsis' Set | binary search implementation math two pointers | Statement | A | Codeforces Round 887 (Div. 1) {1852} | PROGRAMMING | 500.0 | Codeforces Round 887 (Div 1, Div 2) Tutorial | |
| 13084 | Colorful Table | binary search data structures dp implementation math sortings two pointers | Statement | C | CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!) {1870} | PROGRAMMING | 1500.0 | CodeTON Round 6 (Div. 1 + Div. 2, Rated, Prizes!) Editorial | |
| 4546 | Suspicious logarithms | binary search brute force implementation math number theory | Statement | D | Codeforces Round 907 (Div. 2) {1891} | PROGRAMMING | 1500.0 | ||
| 8561 | Yet Another Monster Fight | binary search greedy implementation math | Statement | D | Educational Codeforces Round 158 (Rated for Div. 2) {1901} | PROGRAMMING | Educational Codeforces Round 158 Editorial | ||
| 4598 | Cyclic MEX | binary search constructive algorithms data structures implementation math two pointers | Statement | D | Codeforces Round 915 (Div. 2) {1905} | PROGRAMMING | 2000.0 | Codeforces Round 915 (Div. 2) Editorial | |
| 6472 | Array Repetition | binary search data structures dp implementation math | Statement | D | Codeforces Round 919 (Div. 2) {1920} | PROGRAMMING | 2000.0 | Editorial for Codeforces Round #919 (Div. 2) | |
| 14797 | Vlad and an Odd Ordering | binary search bitmasks data structures dp implementation math number theory | Statement | E | Codeforces Round 928 (Div. 4) {1926} | PROGRAMMING | 126132 | ||
| 1645 | Distance Learning Courses in MAC | binary search bitmasks data structures greedy implementation math | Statement | E | Codeforces Round 932 (Div. 2) {1935} | PROGRAMMING | 2500.0 | Codeforces Round #932 (Div. 2) Editorial | |
| 3550 | Pinball | binary search implementation math | Statement | B | Codeforces Round 930 (Div. 1) {1936} | PROGRAMMING | 1000.0 | Codeforces Round 930 (Div. 1, Div. 2) Editorial | |
| 14908 | Permutation Counting | binary search greedy implementation math sortings | Statement | A | Codeforces Round 942 (Div. 1) {1967} | PROGRAMMING | 750.0 | Tutorial | 1400 |
| 12422 | Circle Perimeter | binary search brute force dfs and similar geometry implementation math | Statement | F | Codeforces Round 944 (Div. 4) {1971} | PROGRAMMING | Codeforces Round 944 (Div. 4) Editorial | 1600 | |
| 2861 | Chain Queries | binary search data structures dfs and similar implementation trees | Statement | E | Codeforces Round 947 (Div. 1 + Div. 2) {1975} | PROGRAMMING | 2000.0 | editorial_zh.pdf | 2100 |
| 650 | Game in Tree (Easy Version) | binary search data structures games implementation trees | Statement | F1 | Codeforces Round 973 (Div. 2) {2013} | PROGRAMMING | 2000.0 | 134298 | |
| 7440 | Minimize the Difference | binary search data structures greedy implementation math | Statement | D | Codeforces Round 973 (Div. 2) {2013} | PROGRAMMING | 2000.0 | 134298 | |
| 5161 | Speedbreaker | binary search dp greedy implementation math two pointers | Statement | B | Codeforces Round 975 (Div. 1) {2018} | PROGRAMMING | 750.0 | Editorial of Codeforces Round 975 (Div. 1, Div. 2) | |
| 5814 | Sums of Segments | binary search data structures dp implementation math | Statement | D | Educational Codeforces Round 171 (Rated for Div. 2) {2026} | PROGRAMMING | Educational Codeforces Round 171 Editorial | ||
| 13231 | Alice's Adventures in Permuting | binary search implementation math | Statement | B | Codeforces Round 986 (Div. 2) {2028} | PROGRAMMING | 1000.0 | Codeforces Round 986 (Div. 2) Editorial | |
| 5809 | Yet Another Real Number Problem | binary search brute force data structures dp greedy implementation math two pointers | Statement | D | Codeforces Global Round 27 {2035} | PROGRAMMING | 1500.0 | Codeforces Global Round 27 Editorial | |
| 17964 | Insane Problem | binary search greedy implementation math | Statement | E | Codeforces Round 993 (Div. 4) {2044} | PROGRAMMING | Codeforces Round 993 (Div. 4) Editorial | ||
| 7662 | Refined Product Optimality | binary search data structures greedy implementation math schedules sortings | Statement | D | Good Bye 2024: 2025 is NEAR {2053} | PROGRAMMING | 1750.0 | Good Bye 2024: 2025 is NEAR Editorial | |
| 2259 | Kevin and Binary String (Easy Version) | binary search brute force data structures dp greedy implementation strings two pointers | Statement | F1 | IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) {2061} | PROGRAMMING | 2000.0 | IAEPC Preliminary Contest (Codeforces Round 999, Div. 1 + Div. 2) Editorial | |
| 12003 | Maximum Subarray Sum | binary search constructive algorithms implementation math | Statement | C | Codeforces Round 1023 (Div. 2) {2107} | PROGRAMMING | 1500.0 | Codeforces Round 1023 (Div 2) Editorial | |
| 2481 | Red Light, Green Light (Hard version) | binary search dfs and similar dp dsu graphs implementation number theory | Statement | D2 | Codeforces Round 1030 (Div. 2) {2118} | PROGRAMMING | 1000.0 | Codeforces Round 1030 (Div. 2) Editorial | |
| 104 | Inter Active (Hard Version) | binary search bitmasks constructive algorithms graphs implementation interactive math probabilities | Statement | G2 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) {2127} | PROGRAMMING | 2750.0 | Atto Round 1 (Codeforces Round 1041, Div. 1 + Div. 2) Editorial | |
| 8772 | From 1 to Infinity | binary search dp implementation math | Statement | D | Codeforces Round 1043 (Div. 3) {2132} | PROGRAMMING | Codeforces Round 1043 (Div. 3) Editorial | ||
| 633 | Antiamuny and Slider Movement | binary search brute force combinatorics implementation math | Statement | D | Codeforces Round 1048 (Div. 1) {2138} | PROGRAMMING | 2500.0 | Codeforces Round 1048 (Div. 1, Div. 2) Editorial | |
| 4917 | Copy String | binary search greedy implementation strings | Statement | D | Codeforces Global Round 30 (Div. 1 + Div. 2) {2164} | PROGRAMMING | 1750.0 | Codeforces Global Round 30 Editorial | |
| 8987 | khba Loves to Sleep! | binary search data structures geometry implementation math | Statement | E | Codeforces Round 1062 (Div. 4) {2167} | PROGRAMMING | Arpa Video Tutorial | ||
| 8453 | Removal of a Sequence (Easy Version) | binary search bitmasks geometry implementation math number theory | Statement | D1 | Educational Codeforces Round 184 (Rated for Div. 2) {2169} | PROGRAMMING | Educational Codeforces Round 184 Editorial | ||
| 2251 | Removal of a Sequence (Hard Version) | binary search constructive algorithms divide and conquer greedy implementation math number theory probabilities | Statement | D2 | Educational Codeforces Round 184 (Rated for Div. 2) {2169} | PROGRAMMING | Educational Codeforces Round 184 Editorial | ||
| 766 | RReeppeettiittiioonn | binary search brute force implementation math number theory | Statement | B | Codeforces Round 1092 (Unrated, Div. 1, Based on THUPC 2026 — Finals) {2215} | PROGRAMMING | 1250.0 |