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https://leetcode.com/problems/repeated-dna-sequences/ All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGA 阅读全文
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https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/ Given an array of integers that is already sorted in ascending order, find two numbers 阅读全文
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https://leetcode.com/problems/convert-bst-to-greater-tree/ Given a Binary Search Tree (BST), convert it to a Greater Tree such that every key of the o 阅读全文
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https://leetcode.com/problems/uncommon-words-from-two-sentences We are given two sentences A and B. (A sentence is a string of space separated words. 阅读全文
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https://leetcode.com/problems/path-sum-iii You are given a binary tree in which each node contains an integer value. Find the number of paths that sum 阅读全文