Envío 491

Código

#include <iostream>
#include <vector>

using namespace std;

int main() {
    int N;
    cin >> N;
    vector<int> A(N);
    vector<vector<int>> totals(N);
    for (int i = 0; i < N; i++) {
        totals[i].resize(N);
    }
    long sum = 0;
    for (int i = 0; i < N; ++i) {
        int Ai;
        cin >> Ai;
        sum += Ai;
        A[i] = Ai;
        totals[0][i] = sum;
    }
    int C;
    cin >> C;
    int p;
    int q;
    for (int i = 0; i < C; ++i) {
        cin >> p;
        cin >> q;
        if (totals[p][q] == 0) {
            for (int i = p; i >= 0; --i) {
                if (totals[i][q] != 0) {
                    for (int j = i + 1; j <= p; ++j) {
                        totals[j][q] = totals[j - 1][q] - A[j - 1];
                    }
                    break;
                }
            }
        }
        cout << totals[p][q] << endl;
    }
}