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https://leetcode.com/problems/trim-a-binary-search-tree/ Given a binary search tree and the lowest and highest boundaries as L and R, trim the tree so 阅读全文
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https://pintia.cn/problem-sets/994805342720868352/problems/994805415005503488 Given any positive integer N, you are supposed to find all of its prime 阅读全文
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http://codeforces.com/contest/1092/problem/D2 Vova's family is building the Great Vova Wall (named by Vova himself). Vova's parents, grandparents, gra 阅读全文
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http://codeforces.com/contest/1092/problem/D1 Vova's family is building the Great Vova Wall (named by Vova himself). Vova's parents, grandparents, gra 阅读全文
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http://codeforces.com/contest/1092/problem/C Ivan wants to play a game with you. He picked some string ss of length nn consisting only of lowercase La 阅读全文
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http://codeforces.com/contest/1092/problem/B There are nn students in a university. The number of students is even. The ii-th student has programming 阅读全文
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http://codeforces.com/contest/1092/problem/A You are given two integers nn and kk. Your task is to construct such a string ss of length nn that for ea 阅读全文