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Problem Path Sum
Problem Description: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 equ...
分类:其他好文   时间:2014-07-07 19:03:39    阅读次数:165
Problem Linked List Cycle II
Problem Description:Given a linked list, return the node where the cycle begins. If there is no cycle, returnnull.Follow up:Can you solve it without u...
分类:其他好文   时间:2014-07-07 17:00:35    阅读次数:161
Problem Linked List Cycle
Problem Description:Given a linked list, determine if it has a cycle in it.Follow up:Can you solve it without using extra space?Solution: 1 public bo....
分类:其他好文   时间:2014-07-07 16:08:01    阅读次数:151
Problem Populating Next Right Pointers in Each Node II
Problem Description:Follow up for problem "Populating Next Right Pointers in Each Node".What if the given tree could be any binary tree? Would your pr...
分类:其他好文   时间:2014-07-07 15:46:01    阅读次数:267
Leetcode Rotate Image
You are given annxn2D matrix representing an image.Rotate the image by 90 degrees (clockwise).Follow up:Could you do this in-place?矩阵的旋转如1 2 34 5 67 8...
分类:其他好文   时间:2014-07-07 15:13:49    阅读次数:181
poj 2749 Building roads (二分+拆点+2-sat)
Building roads Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 6229   Accepted: 2093 Description Farmer John's farm has N barns, and there are some cows that...
分类:其他好文   时间:2014-06-30 10:55:18    阅读次数:146
N-Queens II
题目 Follow up for N-Queens problem. Now, instead outputting board configurations, return the total number of distinct solutions. 方法 和上题方法一样,使用回溯法,结构基本相同,只需要返回数量。 public i...
分类:其他好文   时间:2014-06-30 06:24:22    阅读次数:273
Set Matrix Zeroes
题目 Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place. Follow up: Did you use extra space? A straight forward solution using O(mn) space is probab...
分类:其他好文   时间:2014-06-30 06:17:09    阅读次数:245
LeetCode: Linked List Cycle II [142]
【题目】 Given a linked list, return the node where the cycle begins. If there is no cycle, return null. Follow up: Can you solve it without using extra space? 【题意】 给定一个单向链表,如果链表有环,则返回环开始的位置。 【思路】 仍然是维护两个指针, p1, p2, p1每次走一步, p2每次走两步 ...
分类:其他好文   时间:2014-06-29 23:59:21    阅读次数:354
LeetCode: Linked List Cycle [141]
【题目】 Given a linked list, determine if it has a cycle in it. Follow up: Can you solve it without using extra space? 【题意】 判断一个单向链表是否有环 【思路】 维护两个指针p1和p2,p1每次向前移动一步,p2每次向前移动两步 如果p2能够追上p1,则说明链表中存在环...
分类:其他好文   时间:2014-06-29 22:51:33    阅读次数:267
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