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OI-codes/Luogu/P4643/P4643.cpp

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#include <bits/stdc++.h>
using namespace std;
int main() {
int n, m, x, y, z, k, ans = 0, a[10001];
cin >> n >> m;
for (int i = 1; i <= n; i++) {
cin >> k;
a[i] = k << 1;
}
for (int i = 0; i < m; i++) {
cin >> x >> y >> z;
a[x] += z;
a[y] += z;
}
sort(a + 1, a + n + 1);
for (int i = n; i >= 1; i -= 2) {
ans += a[i] - a[i - 1];
}
cout << ans / 2 << endl;
return 0;
}