Submission #1515305

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Source Code Expand

#include <bits/stdc++.h>

using namespace std;

typedef pair<int, int> P;
typedef long long int LL;
#define MOD 1000000007

int main() {
    int n, m;
    cin >> n >> m;
    vector<LL> x(n), y(m);
    for (int i = 0; i < n; i++) {
        cin >> x[i];
    }
    for (int i = 0; i < m; i++) {
        cin >> y[i];
    }

    LL lx = 0, ly = 0;
    for (int i = 0; i < n - 1; i++) {
        lx += (x[i + 1] - x[i]) * (i + 1) * (n - 1 - i);
        lx %= MOD;
    }
    for (int i = 0; i < m - 1; i++) {
        ly += (y[i + 1] - y[i]) * (i + 1) * (m - 1 - i);
        ly %= MOD;
    }

    cout << lx * ly % MOD << endl;

    return 0;
}

Submission Info

Judge Result