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Given a non-negative integer c, your task is to decide whether there're two integers a and b such that a2 + b2 = c. Example 1: Example 2: 算法： 1. 递增法。用 阅读全文
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Suppose you have a long flowerbed in which some of the plots are planted and some are not. However, flowers cannot be planted in adjacent plots - they 阅读全文
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You need to find the largest value in each row of a binary tree. Example: 算法： 1.BFS。层级遍历，每层打擂台。 2.DFS。记录从上到下的深度，每层参数里传下去+1即可。（从下到上的深度是通过回传int返回值来递归实现的 阅读全文
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In the "100 game," two players take turns adding, to a running total, any integer from 1..10. The player who first causes the running total to reach o 阅读全文
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You are playing the following Nim Game with your friend: There is a heap of stones on the table, each time one of you take turns to remove 1 to 3 ston 阅读全文
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Given a positive integer num, write a function which returns True if num is a perfect square else False. Note: Do not use any built-in library functio 阅读全文
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Given a binary tree, collect a tree's nodes as if you were doing this: Collect and remove all leaves, repeat until the tree is empty. Example:Given bi 阅读全文
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Given two sparse matrices A and B, return the result of AB. You may assume that A's column number is equal to B's row number. Example: A = [ [ 1, 0, 0 阅读全文