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622 Don't fear, DravDe is kind binary search data structures dp hashing Statement D Codeforces Beta Round 28 (Codeforces format) {28} PROGRAMMING Codeforces Beta Round #28 (Разбор задач A и B) 2600
1399 Zip-line binary search data structures dp hashing Statement D Codeforces Round 345 (Div. 1) {650} PROGRAMMING 2600