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HAOI2011 problem b
其实就是容斥原理了代码: 1 uses math; 2 const maxn=55000; 3 var i,n,a,b,c,d,w,tot:longint; 4 ans:int64; 5 sum,mu,p:array[0..maxn] of int64; 6 procedure ge...
分类:其他好文   时间:2014-06-25 22:10:01    阅读次数:299
李炎恢PHP笔记
PrintEcho print 输出转型$sum=0;$total=(float)$sumIsset() unset()判断一个变量是否存在$echo intval$sum 浮点型Define(“total”,100); 常量一旦定义就不可更改判断句14){Echo’内容’;}?>14){Echo’...
分类:Web程序   时间:2014-06-25 21:47:59    阅读次数:281
leetcode--3Sum Closest
Given an arraySofnintegers, find three integers inSsuch that the sum is closest to a given number, target. Return the sum of the three integers. You m...
分类:其他好文   时间:2014-06-25 15:26:21    阅读次数:203
sas赋值语句,累加语句,keep,drop,rename,retain
赋值语句variable=expression几种赋值的实例:x = x1+x2;x = sum(of x1-x6); 括号中要用ofsum(x,y);如果x或y中有一个为缺失值,sum的结果会将缺失值设为0,而如果用z=x+y;有缺失值的话z的结果会为缺失值ar(1) = br(1); *将数组b...
分类:其他好文   时间:2014-06-25 00:36:53    阅读次数:1693
HDU 4825 Xor Sum 字典树+位运算
点击打开链接 Xor Sum Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 132768/132768 K (Java/Others) Total Submission(s): 291    Accepted Submission(s): 151 Problem Description Zeus 和...
分类:其他好文   时间:2014-06-24 23:43:48    阅读次数:343
Codeforces 396B On Sum of Fractions 规律题
题目链接:点击打开链接 我们把 1 / { u(i)*v(i) }拆开->  (1/(u(i)-v(i)) * ( 1/v(i) - 1/u(i) ) 若n +1  是素数,则显然(1/(u(i)-v(i)) * ( 1/v(i) - 1/u(i) ) 这样完全相同的式子有 u(i)-v(i) 个 那么就可以把前面系数约掉,那么剩下的式子就是 1/2 - 1/(n+1) 若不是,则...
分类:其他好文   时间:2014-06-24 21:36:17    阅读次数:216
LeetCode: Binary Tree Maximum Path Sum [124]
【题目】 Given a binary tree, find the maximum path sum. The path may start and end at any node in the tree. For example: Given the below binary tree, 1 / 2 3 Return 6. 【题意】 给定一棵二叉树,找出其中路径和最大的路径,然会返回最大路径和。 本题中的路径不是从根节点到叶子节点这样的传统的路...
分类:其他好文   时间:2014-06-24 20:42:59    阅读次数:268
leetcode--Triangle
Given a triangle, find the minimum path sum from top to bottom. Each step you may move to adjacent numbers on the row below.For example, given the fol...
分类:其他好文   时间:2014-06-24 18:56:54    阅读次数:240
LeetCode Best Time to Buy and Sell Stock II
class Solution {public: int maxProfit(vector &prices) { int len = prices.size(); if (len < 1) return 0; int sum = 0; in...
分类:其他好文   时间:2014-06-24 11:28:47    阅读次数:193
Leetcode-Sum Root to Leaf Numbers
题目: Given a binary tree containing digits from 0-9 only, each root-to-leaf path could represent a number. An example is the root-to-leaf path 1->2->3 which represents the number 123. Find...
分类:其他好文   时间:2014-06-22 08:30:24    阅读次数:236
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