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Problem: You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizo 阅读全文
posted @ 2016-12-16 12:58
SillyVicky
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Problem: Given a string which consists of lowercase or uppercase letters, find the length of the longest palindromes that can be built with those lett 阅读全文
posted @ 2016-12-16 05:57
SillyVicky
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Problem: Find the sum of all left leaves in a given binary tree. Summary: 求左子叶之和。 Analysis： 1. 求左子叶之和，即需要遍历整棵二叉树，常规的方法则为递归。首先我想到的是调用子函数，在子函数中递归，每递归至一个 阅读全文
posted @ 2016-12-16 05:42
SillyVicky
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