#include <bits/stdc++.h>
using namespace std;
const int INF = 1e9 + 4;
const int N = 4e5 + 5;
const int LG = 20;
int a[N], c[N], st[N * 4], up[N][LG], dpt[N], mx[N];
long long pr[N];
vector < int > adj[N];
void build(int v, int l, int r){
if(l == r){
st[v] = c[l];
return;
}
int mid = (l + r) >> 1;
build(v * 2, l, mid);
build(v * 2 + 1, mid + 1, r);
st[v] = max(st[v * 2], st[v * 2 + 1]);
}
int ask(int v, int l, int r, int ql, int qr){
if(l > qr || r < ql)return -INF;
if(l >= ql && r <= qr)return st[v];
int mid = (l + r) >> 1;
return max(ask(v * 2, l, mid, ql, qr), ask(v * 2 + 1, mid + 1, r, ql, qr));
}
void dfs(int u, int p){
dpt[u] = dpt[p] + 1;
up[u][0] = p;
for(int i = 1; i < LG; i++)
up[u][i] = up[up[u][i - 1]][i - 1];
for(auto v : adj[u]){
if(v == p)
continue;
dfs(v, u);
}
}
int get_up(int u, int k){
k--;
if(dpt[u] <= k)
return INF;
for(int i = 0; i < LG; i++){
if((1ll << i) & k)
u = up[u][i];
}
return u;
}
signed main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
int n;
cin >> n;
map < long long , int > mp;
mp[0] = 0;
for(int i = 1; i <= n; i++){
cin >> a[i];
pr[i] = pr[i - 1] + a[i];
c[i] = mp.count(pr[i]) == 0 ? -1 : mp[pr[i]] + 1;
mx[i] = max(mx[i - 1], c[i]);
mp[pr[i]] = i;
}
build(1, 1, n);
for(int i = 1; i <= n; i++){
int l = i, r = n;
int best = n + 1;
while(r >= l){
int mid = (l + r) >> 1;
if(ask(1, 1, n, i, mid) > i){
best = mid;
r = mid - 1;
}
else l = mid + 1;
}
adj[best].push_back(i);
adj[i].push_back(best);
}
dfs(n + 1, n + 1);
int q;
cin >> q;
while(q--){
int l, r;
cin >> l >> r;
int lst = -1, sz = 0, i = 0;
int lo = 1, hi = r;
while(hi >= lo){
int mid = (lo + hi) >> 1;
if(mx[mid] < l){
i = mid;
lo = mid + 1;
}
else hi = mid - 1;
}
i++;
lo = 0, hi = INF;
sz = (i <= r);
while(lo <= hi){
int mid = (lo + hi) >> 1;
if(get_up(i, mid) <= r){
sz = mid;
lo = mid + 1;
}
else hi = mid - 1;
}
cout << sz << "\n";
}
}
/*
3 2 2 2 4
3 3 3 2 4
*/
