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time limit per test
1 second
memory limit per test
256 megabytes
input
standard input
output
standard output
On Children’s Day, the child got a toy from Delayyy as a present. However, the child is so naughty that he can’t wait to destroy the toy.
The toy consists of n parts and m ropes. Each rope links two parts, but every pair of parts is linked by at most one rope. To split the toy, the child must remove all its parts. The child can remove a single part at a time, and each remove consume an energy. Let’s define an energy value of part i as vi. The child spend vf1 vf2 … vfk energy for removing part i where f1, f2, …, fk are the parts that are directly connected to the i-th and haven’t been removed.
Help the child to find out, what is the minimum total energy he should spend to remove all n parts.
Input
The first line contains two integers n and m (1 ≤ n ≤ 1000; 0 ≤ m ≤ 2000). The second line contains n integers: v1, v2, …, vn (0 ≤ vi ≤ 105). Then followed m lines, each line contains two integers xi and yi, representing a rope from part xi to part yi (1 ≤ xi, yi ≤ n; xi ≠ yi).
Consider all the parts are numbered from 1 to n.
Output
Output the minimum total energy the child should spend to remove all n parts of the toy.
Sample test(s)
input
代码语言：javascript复制4 3
10 20 30 40
1 4
1 2
2 3output
代码语言：javascript复制40input
代码语言：javascript复制4 4
100 100 100 100
1 2
2 3
2 4
3 4output
代码语言：javascript复制400input
代码语言：javascript复制7 10
40 10 20 10 20 80 40
1 5
4 7
4 5
5 2
5 7
6 4
1 6
1 3
4 3
1 4output
代码语言：javascript复制160Note
One of the optimal sequence of actions in the first sample is:
- First, remove part 3, cost of the action is 20.
- Then, remove part 2, cost of the action is 10.
- Next, remove part 4, cost of the action is 10.
- At last, remove part 1, cost of the action is 0.
So the total energy the child paid is 20 10 10 0 = 40, which is the minimum.
In the second sample, the child will spend 400 no matter in what order he will remove the parts.
翻译
在儿童节这一天，我们的小朋友收到了来自Delayyy的礼物：一个玩具。
只是。小朋友实在是太淘气了。他迫不及待的要拆掉这个玩具。 这个玩具由n个部分和m条绳子组成。每条绳子连接着两个部分，而且不论什么两个部分至多由一条绳子直接相连。为了拆掉这个玩具，小朋友必须移除它的全部n个部分。每次他仅仅能移除一个部分。而且移除须要能量。
每个部分都有一个能量值v[i]，他移除第i部分所需的能量是v[f[1]] v[f[2]] … v[f[k]]，当中f[1],f[2],…,f[k]是与i直接相连（且还未被移除）的部分的编号。 请帮助他找到移除n个部分所需的最小总能量。 Input 第一行包括两个整数n,m(1<=n<=10000;0<=m<=2000)。第二行包括n个整数v[1],v[2],…,v[n](0<=v[i]<=10^5)。接下来有m个行，每一行有两个整数x[i]和y[i]，表示一条连接x[i]和y[i]的绳子（1<=x[i],y[i]<=n; x[i]不等于y[i]）。 Output
输出所需的最小能量。
题解
代码语言：javascript复制有没有感觉看了这么长的题目非常累。事实上代码就这么短……
#include<cstdio>
#include<cstring>
#include<iostream>
using namespace std;
int n,m,w[1005];
long long ans=0;
int main()
{
scanf("%d%d",&n,&m);
for(int i=1;i<=n;i )scanf("%d",&w[i]);
for(int i=1;i<=m;i )
{
int x,y;
scanf("%d %d",&x,&y);
ans =min(w[x],w[y]);
}
printf("%lld",ans);
return 0;
}发布者：全栈程序员栈长，转载请注明出处：https://javaforall.cn/116148.html原文链接：https://javaforall.cn
