Timer Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 445    Accepted Submission(s): 90 Problem Description Recently, some archaeologists discovered an ancient relic on a small island in the Pa…

Destroying the bus stations                                                                                     Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)                                                       …

A simple stone game                                                                                                       Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)                                             …

Priest John's Busiest Day Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 1420    Accepted Submission(s): 415 Problem Description John is the only priest in his town. October 26th is the John's…

虽然是一道还是算简单的DP,甚至不用滚动数组也能AC,数据量不算很大. 对于N个数,每个数只存在两个状态,取 和 不取. 容易得出状态转移方程: dp[i][j] = dp[i - 1][j ^ a[i]] + dp[i - 1][j]; dp[i][j] 的意思是,对于数列 中前 i 个数字,使得 XOR 和恰好为 j 的方案数 状态转移方程中的 dp[i - 1][j] 即表示当前这个数字不取, dp[i - 1][j ^ a[i]] 表示当前这个数字要取. 这道题还是要好好理解阿! sou…

做法:打表找规律 大数是过不了这个题的(但可以用来打表) 先找k的前缀,前缀对应边缘数字是哪个 如果第0位是2-9 对应奇数长度的1-8 第0位为1时,第1位为0时对应奇数长度的9,为1-9时对应偶数长度的1-9,剩下的根据奇偶判断先从头到尾再从尾到头跑一编即可 如100会得到909 100234会得到902343209 110会得到1001 11234会得到12344321 #include <iostream> #include <string> using namespace…

题目链接  2017 Beijing Problem H 题意  给定一个$n * m$的矩阵,现在可以把矩阵中的任意一个数换成$p$,求替换之后最大子矩阵的最小值. 首先想一想暴力的方法,枚举矩阵中的数,然后$O(n^{3})$求最大子矩阵更新答案,这样复杂度是$O(n^{5})$的. 思考得再仔细一些,就是包含这个数的最大子矩阵和,以及不包含这个数的最大子矩阵的和的较大值. 设原矩阵中最大子矩阵和为$mx$. 设$u_{i}$为只考虑矩阵前$i$行的最大子矩阵和,$d_{i}$为考虑矩阵第$…

Fractal Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://hihocoder.com/contest/acmicpc2015beijingonline/problem/8 Description This is the logo of PKUACM 2016. More specifically, the logo is generated as follows: 1. Put four points A0(0,0), B0(0,1),…

题意:Alice和Bob两个人去打猎,有两种(只)猎物老虎和狼: 杀死老虎得分x,狼得分y: 如果两个人都选择同样的猎物,则Alice得分的概率是p,则Bob得分的概率是(1-p): 但是Alice事先知道Bob先选老虎的概率是Q,问Alice得分的期望最大值是 求期望 如果先去打老虎,则会有bob先去打狼和bob去打老虎两种情况,期望相加则是alice去打老虎的期望,然后求打狼的期望,比较大小即可 #include<cstdio> #include<iostream> #incl…

100MB=10^5KB=10^8B 100MB=100*2^10KB=100*2^20B Sample Input2100[MB]1[B] Sample OutputCase #1: 4.63%Case #2: 0.00% # include <iostream> # include <cstdio> # include <cstring> # include <algorithm> # include <string> # include &…