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

int main() {
  ios::sync_with_stdio(false);

  int N;
  cin >> N;

  vector<int> A(N);
  for (int i = 0; i < N; ++i) {
    cin >> A[i];
  }

  vector<int> s24(N);
  for (int i = 0; i + 24 <= N; ++i) {
    for (int j = 0; j < 24; ++j) {
      s24[i] += A[i + j];
    }
  }

  int max24 = *max_element(s24.begin(), s24.end());

  int Q;
  cin >> Q;
  for (int _ = 0; _ < Q; ++_) {
    int T, V;
    cin >> T >> V;
    --T;
  
    for (int i = max(0, T - 23); i < T + 1; ++i) {
      max24 = max(max24, s24[i] += V - A[T]);
    }

    A[T] = V;

    cout << max24 << endl;
  }

  return 0;
}