B Equal Rectangles 题意: 给你4*n个数,让你判断能不能用这个4*n个数为边凑成n个矩形,使的每个矩形面积相等 题解: 原本是想着用二分来找出来那个最终的面积,但是仔细想一想,那个面积只能是给出的4*n个数中的最小值和最大值的乘积,如果这两个长度不凑成一个矩形,那么肯定全部矩形的面积会出现不一致的 代码: 1 //The idea was to use dichotomies to find that area, and then use that area to figur…

Codeforces Round #579 (Div. 3) 传送门 A. Circle of Students 这题我是直接把正序.逆序的两种放在数组里面直接判断. Code #include <bits/stdc++.h> using namespace std; typedef long long ll; const int N = 205; int q, n; int a[N], b[N], c[N]; int main() { ios::sync_with_stdio(false);…

题目链接:Codeforces Round #433 (Div. 2) codeforces 854 A. Fraction[水] 题意:已知分子与分母的和,求分子小于分母的 最大的最简分数. #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> using namespace std; int gcd(int a,int b){return b?gcd(b…

A. Circle of Students      题目:https://codeforces.com/contest/1203/problem/A 题意:一堆人坐成一个环,问能否按逆时针或者顺时针正好是 1-n的顺序 思路:水题,把数组开两倍,或者标记当前位置都可以 #include<bits/stdc++.h> #define maxn 100005 #define mod 1000000007 using namespace std; typedef long long ll; int…

B.Equal Rectangles time limit per test2 seconds memory limit per test256 megabytes inputstandard input outputstandard output You are given 4…

思考之后再看题解,是与别人灵魂之间的沟通与碰撞 A. Circle of Students 题意 给出n个数,问它们向左或者向右是否都能成一个环.比如样例5是从1开始向左绕了一圈 [3, 2, 1, 5, 4] 变成 [1, 2, 3, 4, 5]; 思路 我的方法是差分,假如成立,相邻两个数的差的绝对值要么是1要么是n-1. #include<iostream> #include<cstdio> #include<algorithm> #include<cmat…

比赛链接:https://codeforc.es/contest/1203/ A. Circle of Students 题意:\(T\)组询问,每组询问给出\(n\)个数字,问这\(n\)个数字能否围成圆环.(围成圆环指,从某一位开始顺时针或逆时针遍历,数组为\(1, 2, 3, ..., n\)) 分析:把数组复制一份,两个数组首尾相接,正反判定两次即可. AC代码: #include<bits/stdc++.h> #define SIZE 200010 #define rep(i, a,…

D. Searching Rectangles 题目连接: http://codeforces.com/contest/714/problem/D Description Filya just learned new geometry object - rectangle. He is given a field consisting of n × n unit cells. Rows are numbered from bottom to top with integer from 1 to…

C. Equal Sums time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output You are given kk sequences of integers. The length of the ii-th sequence equals to nini. You have to choose exactly two sequen…

D. Counting Rectangles is Fun time limit per test 4 seconds memory limit per test 256 megabytes input standard input output standard output There is an n × m rectangular grid, each cell of the grid contains a single integer: zero or one. Let's call t…