#include <bits/stdc++.h>
using namespace std;
#define int long long
signed main () {
ios::sync_with_stdio(0);
cin.tie(0);
int n; cin >> n;
int arr[n + 1] = {};
for (int i = 1; i <= n; i++) {
cin >> arr[i];
arr[i] += arr[i - 1];
}
int q;
cin >> q;
while (q--) {
int pp[n + 1] = {};
int l, r;
cin >> l >> r;
unordered_map <int, int> dd; dd[arr[r]] = r;
int mx = 0;
for (int i = r - 1; i >= l - 1; i--) {
pp[i] = pp[i + 1];
if (dd.count(arr[i])) pp[i] = max(pp[i], 1 + pp[dd[arr[i]]]);
dd[arr[i]] = i;
mx = max(mx, pp[i]);
}
cout << mx << '\n';
}
}
