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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
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
hdu1027 Ignatius and the Princess II 全排列
STL中的神器next_permutation和prev_permutation函数 全排列...
分类:其他好文   时间:2014-06-24 22:41:03    阅读次数:271
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: Best Time to Buy and Sell Stock II [122]
【题目】 Say you have an array for which the ith element is the price of a given stock on day i. Design an algorithm to find the maximum profit. You may complete as many transactions as you like (ie, buy one and sell one share of the stock multiple times). H...
分类:其他好文   时间:2014-06-24 19:40:53    阅读次数:240
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
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