做游戏

#include <iostream>
#include <cstdio>
#include <algorithm>
using namespace std;
double a[11000];
int main()
{
freopen("game.in","r",stdin);
freopen("game.out","w",stdout);
int n,m;

scanf("%d%d",&n,&m);

for(int i=1;i<=n;i++)
scanf("%lf",&a[i]);

for(int i=1;i<=m;i++)
{
int x,y;
double z;
scanf("%d%d%lf",&x,&y,&z);

a[x]+=z/2;
a[y]+=z/2;
}

sort(a+1,a+n+1);

double ans=0;

for(int i=n;i>=1;i-=2)
ans+=a[i]-a[i-1];

printf("%d",int (ans));

return 0;
}