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8483 Square-free division (easy version) data structures dp greedy math number theory Statement E1 Codeforces Round 708 (Div. 2) {1497} PROGRAMMING 1500.0 Codeforces Round #708 Editorial 1700
1774 Square-free division (hard version) data structures dp greedy hashing math number theory Statement E2 Codeforces Round 708 (Div. 2) {1497} PROGRAMMING 1500.0 Codeforces Round #708 Editorial 2500