Envío 490

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 j = 1; j <= p; ++j) {
        totals[j][q] = totals[j - 1][q] - A[j - 1];
      }
    }
    cout << totals[p][q] << endl;
  }
}