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Path Sum II
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 andsum =...
分类:其他好文   时间:2014-09-13 20:05:35    阅读次数:219
[leetcode]4Sum
[leetcode]Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target....
分类:其他好文   时间:2014-09-13 13:25:25    阅读次数:180
leetCode系列----Unique Paths II
leetcode 的图路径数目问题...
分类:其他好文   时间:2014-09-12 19:11:56    阅读次数:176
3Sum and 4Sum @ Python Leetcode
1)3Sumhttps://oj.leetcode.com/problems/3sum/Given an arraySofnintegers, are there elementsa,b,cinSsuch thata+b+c= 0? Find all unique triplets in the a...
分类:编程语言   时间:2014-09-12 11:38:13    阅读次数:298
LeetCode-- Unique Binary Search Trees II
递归 1 /** 2 * Definition for binary tree 3 * struct TreeNode { 4 * int val; 5 * TreeNode *left; 6 * TreeNode *right; 7 * TreeNode...
分类:其他好文   时间:2014-09-12 11:36:23    阅读次数:183
Java如何获取文件的内容类型?例如:image/gif
网站上传文件后,如果是图片,都要对文件进行处理,压缩、缩放之类的。 import java.nio.file.*;//如果是图片文件,则执行缩放处理 Path source = Paths.get(newFilePath); String contentType = Files.probeContentType(source); if (contentType.starts...
分类:编程语言   时间:2014-09-11 19:23:12    阅读次数:159
print all unique solution to split number n
print all unique solution to split number n, given choice of 1 3 5 10for example if n is 4{1, 1, 1, 1}{1, 3}思路:用DFS肯定可以求解,但需要遍历所有可能,进行剪纸之后用递推实现。主要剪枝思想...
分类:其他好文   时间:2014-09-10 19:27:20    阅读次数:144
Leetcode dfs Path SumII
Path Sum II  Total Accepted: 18489 Total Submissions: 68323My Submissions Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum. For exampl...
分类:其他好文   时间:2014-09-10 01:38:49    阅读次数:223
《C++primer》v5 第12章 动态内存 读书笔记 习题答案
这一章暂时没写完,先留着以后再写。在C++程序中,程序员可以给手动开辟内存,但是这块内存需要手动释放,不便管理,因此新标准提供智能指针类型来管理动态对象。它负责自动释放所指向的对象。shared_prt允许多个指针指向同一个对象unique_ptr独占所指向的对象weak_ptr是一个弱引用,指向s...
分类:编程语言   时间:2014-09-09 21:28:39    阅读次数:413
Leetcode--permutations II
Problem Description: Given a collection of numbers that might contain duplicates, return all possible unique permutations. For example, [1,1,2] have the following unique permutations: [1,1,2...
分类:其他好文   时间:2014-09-09 16:17:29    阅读次数:200
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