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题目描述： We are to write the letters of a given string S, from left to right into lines. Each line has maximum width 100 units, and if writing a letter w 阅读全文
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题目描述： Given an 2D board, count how many battleships are in it. The battleships are represented with 'X's, empty slots are represented with '.'s. You m 阅读全文
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题目描述： Given a non-empty, singly linked list with head node head, return a middle node of linked list. If there are two middle nodes, return the second 阅读全文
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题目描述： Consider all the leaves of a binary tree. From left to right order, the values of those leaves form a leaf value sequence. For example, in the g 阅读全文
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题目描述： Given two strings representing two complex numbers. You need to return a string representing their multiplication. Note i2 = -1 according to the 阅读全文
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题目描述： A string S of lowercase letters is given. We want to partition this string into as many parts as possible so that each letter appears in at most 阅读全文
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题目描述： Given a matrix A, return the transpose of A. The transpose of a matrix is the matrix flipped over it's main diagonal, switching the row and colu 阅读全文