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LeetCode: Path Sum II [113]
【题目】 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 ...
分类:其他好文   时间:2014-06-20 10:53:08    阅读次数:181
projecteuler---->problem=20----Factorial digit sum
n! means n (n 1) ... 3 2 1 For example, 10! = 10 9 ... 3 2 1 = 3628800, and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27. Find the sum of the digits...
分类:其他好文   时间:2014-06-20 09:34:10    阅读次数:215
LeetCode: Path Sum [112]
【题目】 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 / ...
分类:其他好文   时间:2014-06-07 13:57:37    阅读次数:210
projecteuler---->problem=21----Amicable numbers
Let d(n) be defined as the sum of proper divisors of n (numbers less than n which divide evenly into n). If d(a) = b and d(b) = a, where a b, then a and b are an amicable pair and each of a and b...
分类:其他好文   时间:2014-06-07 13:40:53    阅读次数:226
Introduction to Probability (4) Counting
当我们计算概率的时候,假设样本空间中的各个样本发生的概率均等,那么,时间A发生的概率为: 所以我们只需要计算时间A包含的样本个数,比上总的样本数,就能得到事件A发生的概率。 基本的counting原则 假设一次实验共有r个阶段,每个阶段有ni种选择,那么总的样本空间是各个阶段的各种选择的乘积。 排列permutation与组合combination 当我们要从n个样本中选...
分类:其他好文   时间:2014-06-07 11:34:58    阅读次数:261
leetcode--Sum Root to Leaf Numbers
Given a binary tree containing digits from0-9only, each root-to-leaf path could represent a number.An example is the root-to-leaf path1->2->3which rep...
分类:其他好文   时间:2014-06-06 12:38:42    阅读次数:255
SafeArray
API: SafeArrayCreate SafeArrayDestroy SafeArrayGetElement SafeArrayPutElement SafeArrayGetLBound SafeArrayGetUBound1 STDMETHODIMP CMath::Sum(VAR...
分类:其他好文   时间:2014-06-06 10:09:56    阅读次数:150
js变量作用域
for(var i =0;i<100;i++) { }alert(i);//100if(true){ var i="91d"; } alert(i);//91d function add(ad1,ad2){ sum=ad1+ad2; return sum;//如果没有用...
分类:Web程序   时间:2014-06-06 09:25:07    阅读次数:256
codeforces --- Round #250 (Div. 2) B. The Child and Set
【题目大意】给你一个sum和一个limit,现在要你在1~limit中找到一些数来使得这些数的和等于sum,如果能找到的话就输出找到的数的个数和这些数,未找到输出"-1"。比赛的时候被hack了。【题目分析】这题需要将所有的数的lowbit先求出来,然后按照大小排序,然后从后往前判断,如果这个数小于...
分类:其他好文   时间:2014-06-05 20:36:44    阅读次数:307
leetcode--Add Binary
Given two binary strings, return their sum (also a binary string).For example,a ="11"b ="1"Return"100".public class Solution { /**The program is us...
分类:其他好文   时间:2014-06-05 14:08:35    阅读次数:188
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