#include "bits/stdc++.h"
using namespace std;
#define ll long long
#define forn(i,n) for(int i=0;i<n;i++)
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(),v.rend()
#define pb push_back
#define sz(a) (int)a.size()
void solve()
{
int n, q;
cin >> n;
vector<ll> a(n + 1), p(n + 1);
for(int i = 1;i <= n;++i){
cin >> a[i];
p[i] = p[i - 1] + a[i];
}
cin >> q;
vector<vector<int>> nxt(20, vector<int>(2e5 + 1, -1));
map<ll,int> m;
for(int i = n; i >= 0;--i){
if(a[i] == 0)nxt[0][i] = i;
if(m.count(p[i]))nxt[0][i + 1] = m[p[i]];
m[p[i]] = i;
}
for(int i = n - 1;i >= 1;--i){
if(nxt[0][i + 1] != -1){
if(nxt[0][i] == -1)nxt[0][i] = nxt[0][i + 1];
nxt[0][i] = min(nxt[0][i], nxt[0][i + 1]);
}
}
for(int j = 1;j < 20;++j){
for(int i = 1;i <= n;++i){
if(nxt[j - 1][i] != -1){
nxt[j][i] = nxt[j - 1][nxt[j - 1][i] + 1];
}
}
}
while(q--)
{
int l, r;
cin >> l >> r;
int i = l;
ll ans = 0;
for(int j = 19;j >= 0;--j){
if(nxt[j][i] != -1 && i <= r && nxt[j][i] <= r){
ans += (1 << j);
i = nxt[j][i] + 1;
}
}
cout << ans << "\n";
}
}
int32_t main()
{
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int t = 1;
//cin >> t;
while(t--)
{
solve();
}
}
