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13712 Spy-string bitmasks brute force constructive algorithms dp hashing strings Statement F Codeforces Round 644 (Div. 3) {1360} PROGRAMMING Codeforces Round #644 (Div. 3) Editorial 1700
21454 MIN-MEX Cut bitmasks constructive algorithms dp Statement B Codeforces Global Round 16 {1566} PROGRAMMING 750.0 Codeforces Global Round 16 Editorial
12109 Bit Flipping bitmasks constructive algorithms greedy strings Statement B Codeforces Round 782 (Div. 2) {1659} PROGRAMMING 750.0 Codeforces Round #782 (Div. 2) Editorial
1170 Tree Recovery bitmasks brute force constructive algorithms dfs and similar dsu graphs trees Statement F Codeforces Global Round 21 {1696} PROGRAMMING 2500.0 Editorial of Codeforces Global Round 21
1970 Serval and Shift-Shift-Shift bitmasks brute force constructive algorithms implementation Statement D Codeforces Round 853 (Div. 2) {1789} PROGRAMMING 1750.0 Codeforces Round #853 (Div. 2) Editorial
3127 Guess Game bitmasks combinatorics constructive algorithms data structures games math probabilities strings trees Statement E Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) {1864} PROGRAMMING 2000.0 Harbour.Space Scholarship Contest 2023-2024 (Div. 1 + Div. 2) Editorial
18818 XOR Palindromes bitmasks constructive algorithms strings Statement B Codeforces Round 897 (Div. 2) {1867} PROGRAMMING 1000.0
2811 Candy Party (Hard Version) bitmasks constructive algorithms dp graphs greedy implementation math Statement B2 Codeforces Round 896 (Div. 1) {1868} PROGRAMMING 750.0 Codeforces Round 896 (Div. 1, Div. 2) Editorial
8454 Candy Party (Easy Version) bitmasks constructive algorithms graphs greedy implementation math Statement B1 Codeforces Round 896 (Div. 1) {1868} PROGRAMMING 500.0 Codeforces Round 896 (Div. 1, Div. 2) Editorial
15085 StORage room bitmasks brute force constructive algorithms greedy Statement B Codeforces Round 912 (Div. 2) {1903} PROGRAMMING 1000.0 Codeforces Round #912 (Div. 2) Editorial
7977 Fixing a Binary String bitmasks brute force constructive algorithms greedy hashing strings Statement D Codeforces Round 951 (Div. 2) {1979} PROGRAMMING 2000.0 Codeforces Round 951 (Div. 2) Editorial
19886 Fun Game bitmasks constructive algorithms greedy math Statement B Codeforces Round 959 sponsored by NEAR (Div. 1 + Div. 2) {1994} PROGRAMMING 1000.0 Video Tutorial
2171 Interactive RBS (Hard Version) binary search bitmasks constructive algorithms dp interactive Statement C3 Codeforces Round 1040 (Div. 1) {2129} PROGRAMMING 750.0 Codeforces Round 1040 (Div. 1, Div. 2) Editorial
5090 Interactive RBS (Easy Version) binary search bitmasks constructive algorithms interactive Statement C1 Codeforces Round 1040 (Div. 1) {2129} PROGRAMMING 750.0 Codeforces Round 1040 (Div. 1, Div. 2) Editorial
3675 Interactive RBS (Medium Version) binary search bitmasks constructive algorithms interactive Statement C2 Codeforces Round 1040 (Div. 1) {2129} PROGRAMMING 750.0 Codeforces Round 1040 (Div. 1, Div. 2) Editorial
1464 Product of Closures bitmasks brute force constructive algorithms dp greedy implementation math Statement E Educational Codeforces Round 192 (Rated for Div. 2) {2242} PROGRAMMING 155047
6433 MEXOR bitmasks constructive algorithms math Statement C Spectral::Cup 2026 Round 3 (Codeforces Round 1110, Div. 1 + Div. 2) {2245} PROGRAMMING 1250.0 Spectral::Cup 2026 Round 3 (Codeforces Round 1110, Div. 1 + Div. 2) Editorial