D. Shichikuji and Power Grid</centerD.> Shichikuji is the new resident deity of the South Black Snail Temple. Her first job is as follows: There are…

链接: https://codeforces.com/contest/1245/problem/D 题意: Shichikuji is the new resident deity of the South Black Snail Temple. Her first job is as follows: There are n new cities located in Prefecture X. Cities are numbered from 1 to n. City i is locate…

题目链接:https://codeforces.com/contest/1245/problem/D 题目大意: 平面上有n座城市,第i座城市的坐标是 \(x[i], y[i]\) , 你现在要给n城市供电,对于第i座城市,你可以选择两种方式给其供电: 建造一个发电站供电,这需要花费 \(c[i]\) : 连一条连向城市j的电缆,这需要花费 \((|x[i]-x[j]|+|y[i]-y[j]|) \times (k[i]+k[j])\) . 现在告诉你n以及 \(x[i], y[i], c[i]…

#include<bits/stdc++.h> using namespace std ; int n; struct City { int id; long long x,y; //坐标 long long cc,kk; //自建的花费,连线的花费 bool self;//是否建站 int fa;//连线的站 bool operator < (const City & a)const { return cc<a.cc; } } c[]; int main() { scan…

A - Good ol' Numbers Coloring 题意:有无穷个格子,给定 \(a,b\) ,按以下规则染色: \(0\) 号格子白色:当 \(i\) 为正整数, \(i\) 号格子当 \(i\geq a\) 且 \(i-a\) 是白色格子时涂白色:当 \(i\) 为正整数, \(i\) 号格子当 \(i\geq b\) 且 \(i-b\) 是白色格子时涂白色:仍不是白色的涂黑色,问黑色格子是否有无穷个. 题解:好像做过很多次了,遍历所有的整数的充要条件是这些拿来线性组合的步长的gcd…

Codeforces Beta Round #80 (Div. 2 Only) A Blackjack1 题意 一共52张扑克,A代表1或者11,2-10表示自己的数字,其他都表示10 现在你已经有一个queen了,问你有多少种方案,能够得到n点 题解 其实只用考虑三种情况,都考虑一下就好了,实在不行就暴力枚举-- 代码 #include<bits/stdc++.h> using namespace std; int n; int main() { scanf("%d",&…

Codeforces Beta Round #83 (Div. 1 Only) A. Dorm Water Supply 题意 给你一个n点m边的图,保证每个点的入度和出度最多为1 如果这个点入度为0,那么这个点就是水龙头点. 如果这个点的出度为0,那么这个点就是储存点. 现在让你把所有水龙头到储存点的路径都输出出来,且输出这条路径的边权最小值 题解 显然是个仙人掌图,所以直接XJB暴力就好了 代码 #include<bits/stdc++.h> using namespace std; co…

Codeforces Beta Round #79 (Div. 2 Only) http://codeforces.com/contest/102 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define sqr(x) ((x)*(x)) #define pb push_back #define eb empla…

Codeforces Beta Round #77 (Div. 2 Only) http://codeforces.com/contest/96 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define sqr(x) ((x)*(x)) #define pb push_back #define eb emplac…

Codeforces Beta Round #76 (Div. 2 Only) http://codeforces.com/contest/94 A #include<bits/stdc++.h> using namespace std; #define lson l,mid,rt<<1 #define rson mid+1,r,rt<<1|1 #define sqr(x) ((x)*(x)) #define pb push_back #define eb emplac…