#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define endl "\n"
using namespace std;
using namespace __gnu_pbds;
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
template <typename T, typename key = less<T>>
using ordered_set = tree<T, null_type, key, rb_tree_tag, tree_order_statistics_node_update>;
const ll lg = 19, N = 4e5 + 5;
int up[lg][N];
void solve()
{
int n;
cin >> n;
int a[n + 1];
ll pref[n + 1];
pref[0] = 0;
for (int i = 1; i <= n; i++)
cin >> a[i], pref[i] = pref[i - 1] + a[i];
map<ll, int> last;
int mn = n + 1;
for (int i = n; i >= 1; i--)
{
last[pref[i]] = i;
if (last.count(pref[i - 1])) mn = min(mn, last[pref[i - 1]]);
up[0][i] = mn + 1;
}
// for (int i = 1; i <= n; i++) cout << up[0][i] << " \n"[i == n];
for (int i = 0; i < lg; i++) up[i][n + 2] = up[i][n + 1] = n + 2;
for (int bit = 1; bit < lg; bit++)
for (int i = 1; i <= n; i++) up[bit][i] = min((int)n + 2, up[bit - 1][up[bit - 1][i]]);
int q;
cin >> q;
// cout << up[18][1] << endl;
while (q--)
{
int l, r;
cin >> l >> r;
int ans = 0;
for (ll bit = lg - 1; bit >= 0; bit--)
if (up[bit][l] <= r + 1) ans += 1 << bit, l = up[bit][l];
cout << ans << endl;
}
}
int main()
{
ios_base::sync_with_stdio(0);
cin.tie(0);
ll t = 1;
// precomp();
// cin >> t;
for (ll cs = 1; cs <= t; cs++)
solve();
// cerr << "\nTime elapsed: " << clock() * 1000.0 / CLOCKS_PER_SEC << " ms\n";
}
