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2213 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
4115 Xor Tree binary search bitmasks data structures divide and conquer dp trees Statement C Codeforces Round 683 (Div. 1, by Meet IT) {1446} PROGRAMMING 1250.0 E
1853 Stringforces binary search bitmasks data structures dp greedy strings two pointers Statement E Educational Codeforces Round 111 (Rated for Div. 2) {1550} PROGRAMMING Educational Codeforces Round 111 Editorial
1640 RBS binary search bitmasks data structures dp Statement F Educational Codeforces Round 115 (Rated for Div. 2) {1598} PROGRAMMING 95890
1810 MinimizOR binary search bitmasks data structures dp greedy implementation Statement E Codeforces Round 781 (Div. 2) {1665} PROGRAMMING 2250.0 Codeforces Round #781 (Div. 2) Editorial
15034 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