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12064 Planar Reflections brute force combinatorics data structures dp Statement C CodeCraft-21 and Codeforces Round 711 (Div. 2) {1498} PROGRAMMING 1750.0 CodeCraft-21 and Codeforces Round #711 (Div. 2) Editorial
2489 Staircases brute force combinatorics data structures dfs and similar dp Statement E Educational Codeforces Round 115 (Rated for Div. 2) {1598} PROGRAMMING 95890
2227 Fenwick Tree bitmasks brute force combinatorics data structures dp math trees Statement C Codeforces Round 942 (Div. 1) {1967} PROGRAMMING 1250.0 Tutorial 2300
1963 MEXimize the Score brute force combinatorics data structures dp math Statement E Codeforces Round 979 (Div. 2) {2030} PROGRAMMING 2000.0 Codeforces Round 979 Editorial