一个IT菜鸟的自白

Given an array of integers, find two numbers such that they add up to a specific target number.The function twoSum should return indices of the two numbers such that they add up to the target, whe

1.Next Permutation        原文链接：点击这里进入        基本内容：            解题思想：        所谓一个排列的下一个排列的意思就是 这一个排列与下一个排列之间没有其他的排列。这就要求这一个排列与下一个排列有尽可能长的共同前缀，也即变化限制在尽可能短的后缀上。可能理解起来比较难懂。 

Longest Consecutive SequenceGiven an unsorted array of integers, find the length of the longest consecutive elements sequence.For example,Given [100, 4, 200, 1, 3, 2],The longe

c++dfs// LeetCode, Clone Graph// DFS，时间复杂度 O(n)，空间复杂度 O(n)class Solution {public:    UndirectedGraphNode *cloneGraph(const UndirectedGraphNode *node) {         if(node == nullptr) return

Given n non-negative integers representing the histogram's bar height where the width of each bar is 1, find the area of largest rectangle in the histogram.Above is a histogram where width of

/** * Definition for singly-linked list. * struct ListNode { *     int val; *     ListNode *next; *     ListNode(int x) : val(x), next(NULL) {} * }; */class Solution {public:    Li

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