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摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805355987451904 A Binary Search Tree (BST) is recursively defined as a binary tree which 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805372601090048 A family hierarchy is usually presented by a pedigree tree where all the 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805379664297984 Indeed there are many different tourist routes from our city to Rome. Yo 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805376476626944 A supply chain is a network of retailers（零售商）, distributors（经销商）, and su 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805370650738688 Among all the factors of a positive integer N, there may exist several c 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805343236767744 The task of this problem is simple: insert a sequence of distinct positi 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805389634158592 The task of this problem is simple: insert a sequence of distinct positi 阅读全文

摘要： https://leetcode.com/problems/reverse-string-ii/ Given a string and an integer k, you need to reverse the first k characters for every 2k characters c 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805464397627392 A traveler's map gives the distances between cities along the highways, 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805466364755968 Given an increasing sequence S of N integers, the median is the number a 阅读全文