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1321 Odd Mineral Resource bitmasks data structures hashing probabilities trees Statement D Codeforces Round 700 (Div. 1) {1479} PROGRAMMING 2250.0 Editorial of Codeforces Round #700
2637 Kazaee data structures hashing probabilities Statement F Codeforces Global Round 23 {1746} PROGRAMMING 2500.0 Codeforces Global Round 23 Editorial
1519 Hossam and Range Minimum Query binary search bitmasks data structures hashing probabilities strings trees Statement F Codeforces Round 837 (Div. 2) {1771} PROGRAMMING 3500.0 Codeforces Round #837 (Div. 2) Editorial
660 Frequency Mismatch (Easy Version) binary search data structures divide and conquer hashing probabilities trees Statement F1 Codeforces Round 940 (Div. 2) and CodeCraft-23 {1957} PROGRAMMING 2250.0 Codeforces Round #940 and CodeCraft-23 (Div. 2) Editorial 2600
605 Frequency Mismatch (Hard Version) binary search data structures dfs and similar hashing probabilities trees Statement F2 Codeforces Round 940 (Div. 2) and CodeCraft-23 {1957} PROGRAMMING 1250.0 Codeforces Round #940 and CodeCraft-23 (Div. 2) Editorial 2700