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LeetCode Gas Station
class Solution {public: int canCompleteCircuit(vector &gas, vector &cost) { int len = gas.size(); if (len diff(len, 0); for (...
分类:其他好文   时间:2014-05-15 01:58:39    阅读次数:358
Leetcode:Climbing Stairs 斐波那契数
戳我去解题You are climbing a stair case. It takesnsteps to reach to the top.Each time you can either climb 1 or 2 steps. In how many distinct ways can you ...
分类:其他好文   时间:2014-05-15 01:55:06    阅读次数:251
[leetcode]_Maximum Depth of Binary Tree
第三道树的题目,我还是不会,我擦,怎么递归算法还是不能很好理解。看来还得好好研究下递归算法。题目:求一棵树的最大深度。思路:递归地求取左子树最大深度 和 右子树最大深度,返回较大值即为 整棵树的 最大深度。代码:public int maxDepth(TreeNode root) { ...
分类:其他好文   时间:2014-05-14 23:07:14    阅读次数:373
Leetcode:Best Time to Buy and Sell Stock
Best Time to Buy and Sell Stock1Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to comp...
分类:其他好文   时间:2014-05-14 22:36:11    阅读次数:353
Leetcode 线性表 Remove Duplicates from Sorted Array II
题意:从一个已排序的数组中移除掉重复的元素,每个元素最多可重复两次 思路: 思路和Remove Duplicates from Sorted Array一样,不过要设置一个计数变量,表示当前值出现的次数 出现次数少于2可以加入到新数组,多于2则不可以。每次遇到一个新变量要把计数变量重新设置为1,加入新数组要加1 复杂度:时间O(n), 空间O(1)...
分类:其他好文   时间:2014-05-14 21:03:00    阅读次数:262
LeetCode 008 String to Integer (atoi)
【题目】 Implement atoi to convert a string to an integer. Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases. Notes: It is intended for this problem to be s...
分类:其他好文   时间:2014-05-14 21:00:57    阅读次数:304
LeetCode--Binary Tree Preorder Traversal
Binary Tree Preorder Traversal  Total Accepted: 18022 Total Submissions: 51784My Submissions Given a binary tree, return the preorder traversal of its nodes' values. For example: Given b...
分类:其他好文   时间:2014-05-14 20:43:22    阅读次数:242
LeetCode 007 Reverse Integer
【题目】 Reverse digits of an integer. Example1: x = 123, return 321 Example2: x = -123, return -321 【题意】 反转int型整数,输出的也是int型的整数 【思路】 如要考虑两种特殊情况: 1. 类似100这样的整数翻转之后为1 2. 翻转之后的值溢出该如何处理, 本题的测试用例中似乎没有给出溢出的情况 ...
分类:其他好文   时间:2014-05-14 20:41:19    阅读次数:244
LeetCode 009 Palindrome Number
【题目】 Determine whether an integer is a palindrome. Do this without extra space. 【题意】 题意判断一个整数是否是回文数 注意一下几点: 1. 不能用额外的空间 2. 负数不是回文数...
分类:其他好文   时间:2014-05-14 20:31:10    阅读次数:298
leetcode -day 15 Distinct Subsequences
1、 ?? Distinct Subsequences  Given a string S and a string T, count the number of distinct subsequences of T in S. A subsequence of a string is a new string which is formed from the original str...
分类:其他好文   时间:2014-05-14 20:22:58    阅读次数:275
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