D. Pair of Numbers time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Simon has an array a1, a2, ..., an, consisting of n positive integers. Today Simon asked you to find a pair of integers l…

Interesting drink 题目链接: http://codeforces.com/contest/706/problem/B Description Vasiliy likes to rest after a hard work, so you may often meet him in some bar nearby. As all programmers do, he loves the famous drink "Beecola", which can be bough…

A. Table time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Simon has a rectangular table consisting of n rows and m columns. Simon numbered the rows of the table from top to bottom starting f…

解题思路: 如果序列a是单调递增的,则序列为1,2,..... 2n,则将给出的式子化简得Σ(a2i - a2i-1) = n 如果序列a是单调递减的,则序列为2n,.........2, 1,则将给出的式子化简得为0 故本题的解决方法是前面2k个序列即a1,a2......a2k是单调递增的,后面的序列是单调递减的 #include <iostream> using namespace std; int main(){ int n , k; cin >> n >> k…

#include <iostream> #include <vector> using namespace std; int main(){ int n,m; cin >> n >> m; ][]; bool flag = false; ; i < n ; ++ i){ ; j < m ; ++ j){ cin >> a[i][j]; } } ; j < m; ++ j){ ][j] || a[n-][j]){ flag = t…

刷了一页的WA  ..终于发现了 哪里错了 快速幂模板里一个变量t居然开得long  ... 虽然代码写的丑了点 但是是对的 那个该死的long 啊.. #include <iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<stdlib.h> #include<vector> using namespace std; #define mo…

A: 要么是两次要么4次,判断是否在边界: #include<cstdio> using namespace std; int main() { int n,m,x; ; scanf("%d%d",&n,&m); ; i<n; i++) ; j<m; j++) { scanf("%d",&x); &&(i==||i==n-||j==||j==m-)) flag=; } "); ");…

传送门 题意 给出n个数及x,求 \[\frac{\sum _{i=1}^n x^{a_1+a_2+...+a_{i-1}+a_{i+1}+...a_n}}{\prod_{i=1}^n x^{a_i}}\] 分析 结果必然为\(x^{sum}\),sum的值首先取所有数的和减去最大值 然后暴力合并,具体原因我不太懂,只能附上CF的标准题解 Obviously, the answer is \(x^v\). Let \(sum = a1 + a2 + ... + an\). Also let $s…

题意: 有长为n的a,b两序列,问满足ai+aj>bi+bj(i<j)的i,j对数. 思路: 移项得:(ai-bi)+(aj-bj)>0,i<j即i!=j,用c序列保存所有ai-bi的值,排序,若左右数之和大于0,则右数与二数间的数之和都大于0,计入结果后移动右指针,否则移动左指针. Tips: c[i]+c[j]和ans可能会超范围 #include <bits/stdc++.h> using namespace std; typedef long long ll;…

题目链接: http://codeforces.com/contest/734/problem/D D. Anton and Chess time limit per test4 secondsmemory limit per test256 megabytes 问题描述 Anton likes to play chess. Also, he likes to do programming. That is why he decided to write the program that pla…