Educational Codeforces Round 47 (Rated for Div. 2) D ---- Relatively Prime Graph

暴力出奇迹，暴力枚举所有的组合如果满足了n个就ok，判断图是否可以联通，边数够不够m个，判断是否有答案。

因为提前知道了，n较大的时候，一定有满足个m的答案，因此实际时间复杂度应该不超过O(m)

#include <bits/stdc++.h>
using namespace std;
const int maxn = 1e5 + 10;
int gcd(int n,int m) {return m == 0 ? n : gcd(m,n%m);}
struct node{ int u,v; } p[maxn];
int main(){int n,m,k = 0;cin >> n >> m;for (int i=1; i<=n && k < m; i++) {for (int j=i+1; j<=n && k < m; j++) {if (gcd(i, j) == 1) {p[k].u = i; p[k].v = j; k ++;}}}if (m < n-1 || k < m) {cout << "Impossible" << endl;return 0;}else{cout << "Possible" << endl;}for (int i=0; i<k; i++){cout << p[i].u << ' ' << p[i].v << endl;}return 0;
}

Educational Codeforces Round 47 (Rated for Div. 2) D ---- Relatively Prime Graph相关推荐

Educational Codeforces Round 47 (Rated for Div. 2) ：E. Intercity Travelling
题目链接:http://codeforces.com/contest/1009/problem/E 解题心得: 一个比较简单的组合数学,还需要找一些规律,自己把方向想得差不多了但是硬是找不到规律,还是 ...
Educational Codeforces Round 47 (Rated for Div. 2) ：C. Annoying Present（等差求和）
题目链接:http://codeforces.com/contest/1009/problem/C 解题心得: 题意就是一个初始全为0长度为n的数列,m此操作,每次给你两个数x.d,你需要在数列中选一 ...
Educational Codeforces Round 90 (Rated for Div. 2)（A, B, C, D, E）
Educational Codeforces Round 90 (Rated for Div. 2) Donut Shops 思路分三种情况: a==c/ba == c / ba==c/b这个时候两 ...
Educational Codeforces Round 138 (Rated for Div. 2) D
Educational Codeforces Round 138 (Rated for Div. 2) D. Counting Arrays 题意给定长度为nnn的数组aaa,若gcd(ai,i)= ...
Educational Codeforces Round 114 (Rated for Div. 2) （A ~ F）全题解
整理的算法模板合集: ACM模板点我看算法全家桶系列!!! 实际上是一个全新的精炼模板整合计划 Educational Codeforces Round 114 (Rated for Div. 2) ...
Educational Codeforces Round 106 (Rated for Div. 2)（A ~ E）题解（每日训练 Day.16 ）
整理的算法模板合集: ACM模板点我看算法全家桶系列!!! 实际上是一个全新的精炼模板整合计划目录 Educational Codeforces Round 106 (Rated for Div. ...
Educational Codeforces Round 37 (Rated for Div. 2) 1
Educational Codeforces Round 37 (Rated for Div. 2) A.Water The Garden 题意:Max想给花园浇水.花园可被视为长度为n的花园床,花园 ...
Educational Codeforces Round 89 (Rated for Div. 2)（A, B, C, D）
Educational Codeforces Round 89 (Rated for Div. 2) A. Shovels and Swords 思路题意非常简单,就是得到最多的物品嘛,我们假定a, ...
Educational Codeforces Round 114 (Rated for Div. 2) D. The Strongest Build 暴力 + bfs
传送门文章目录题意: 思路: 题意: 你有nnn个装备槽,每个槽里面有cic_ici个力量加成,对于每个槽只能选一个力量加成,现在给你mmm个力量组合[b1,b2,...,bn][b_1,b_2 ...
Educational Codeforces Round 72 (Rated for Div. 2) D. Coloring Edges dfs树/拓扑找环
传送门文章目录题意: 思路: 题意: 给你一张图,你需要给这个图的边染色,保证如果有环那么这个环内边的颜色不全相同,输出染色方案和用的颜色个数. n,m≤5e3n,m\le5e3n,m≤5e3 思 ...

Educational Codeforces Round 47 (Rated for Div. 2) D ---- Relatively Prime Graph

Educational Codeforces Round 47 (Rated for Div. 2) D ---- Relatively Prime Graph相关推荐

最新文章

热门文章