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[Educational Codeforces Round 81 (Rated for Div. 2)]E. Permutation Separation(线段树,思维,前缀和) E. Permutation Separation time limit per test 2 seconds memo 阅读全文
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[Educational Codeforces Round 81 (Rated for Div. 2)] D. Same GCDs (数论,因子分解,容斥定理) D. Same GCDs time limit per test 2 seconds memory limit per test 256 阅读全文
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[Educational Codeforces Round 81 (Rated for Div. 2) C. Obtain The String(序列自动机,贪心) C. Obtain The String time limit per test 1 second memory limit per 阅读全文
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Educational Codeforces Round 81 B. Infinite Prefixes B. Infinite Prefixes time limit per test 2 seconds memory limit per test 256 megabytes input stan 阅读全文
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Codeforces Round 615 (Div. 3) F. Three Paths on a Tree 题目链接:https://codeforces.com/contest/1294/problem/F time limit per test 2 seconds memory limit p 阅读全文
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Codeforces Round 612 (Div. 2) C. Garland 动态规划 题目链接: https://codeforces.com/contest/1287/problem/C C. Garland time limit per test 1 second memory lim 阅读全文
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D. Numbers on Tree 构造,树dfs 题目链接:https://codeforces.com/contest/1287/problem/D、 D. Numbers on Tree time limit per test 1 second memory limit per test 2 阅读全文
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"Educational Codeforces Round 80 (Rated for Div. 2)" A. Deadline 如果n =d 直接yes 否则对于公式 $x+ceil(d/(x+1)) include include include include include include 阅读全文