August 2, 2015 在http://zzk.cnblogs.com/ 用"找一找", 花了几个小时, 找出比较好的Leetcode博客. Read the leetcode question and solutions: 1. Find lowest common ancestor in binary tree: blog of a facebook programmer working on leetcode questions: 递归版本:空间O(1),时间O(n) ht…
http://oj.leetcode.com/problems/text-justification/ 编译代码要看warnings!它提供了可能出问题的情况,比如类型转换上unsigned int < int的比较,要用计算机的思维.这道题终究还是没有AC,差不多就这样吧. 要养成好的代码习惯,可以一边写代码,一边debug.注意变量命名之类的,常规问题. Good good study! #include <iostream> #include <vector> #inc…
Find the length of the longest substring T of a given string (consists of lowercase letters only) such that every character in T appears no less than k times. Example 1: Input: s = "aaabb", k = 3 Output: 3 The longest substring is "aaa"…
题目链接:Path Sum II | LeetCode OJ Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11 13 4 / \ / \ 7 2 5 1 return [ [5,4,11,2],…
题目链接:Path Sum | LeetCode OJ Given a binary tree and a sum, determine if the tree has a root-to-leaf path such that adding up all the values along the path equals the given sum. For example: Given the below binary tree and sum = 22, 5 / \ 4 8 / / \ 11…