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2171 Kuro and GCD and XOR and SUM binary search bitmasks brute force data structures dp dsu greedy math number theory strings trees Statement D Codeforces Round 482 (Div. 2) {979} PROGRAMMING 1750.0 Codeforces Round #482 (Div. 2) Editorial 2200
8588 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
6695 Xor-Subsequence (easy version) bitmasks brute force dp strings trees Statement D1 Codeforces Round 815 (Div. 2) {1720} PROGRAMMING 1500.0 Codeforces Round #815 (Div. 2) Editorial
23267 Substring and Subsequence bitmasks brute force dp graphs greedy hashing strings trees Statement B Educational Codeforces Round 167 (Rated for Div. 2) {1989} PROGRAMMING Educational Codeforces Round 167 Editorial