#include <bits/stdc++.h>
using namespace std;

int main() {
  int N; cin >> N;
  vector<int> A(N + 2); for (int i = 1; i <= N; i++) cin >> A.at(i);
  vector<long long> S(N + 2);

  for (int i = 1; i <= N; i++) {
    if (A.at(i) != 0) {
      int R = i;
      long long T = 0;
      while (R != N + 1 && A.at(R) != 0) {
        T += A.at(R);
        R++;
      }
      for (int j = i; j < R; j++) S.at(j) = T;
      i = R - 1;
    }
  }

  int Q; cin >> Q;
  for (int i = 0; i < Q; i++) {
    int X, B; cin >> X >> B;
    cout << (A.at(X) != 0 ? S.at(X) - A.at(X) + B : S.at(X - 1) + S.at(X + 1) + B) << endl;
  }
}