#include <bits/stdc++.h>
#define SQR(x) (1LL * ((x) * (x)))
#define MASK(i) (1LL << (i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define fi first
#define se second
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define sz(s) (int)s.size()
#define prev __prev
#define next __next
#define left __left
#define right __right
#define mp make_pair
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vi vector<int>
#define vll vector<ll>
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef unsigned int ui;
using namespace std;
const int mod = 1e9 + 7;
const int INF = 1e9 + 7;
const ll INFLL = (ll)2e18 + 7LL;
const ld PI = acos(-1);
const int dx[] = {1, -1, 0, 0, -1, 1, 1, -1};
const int dy[] = {0, 0, 1, -1, -1, -1, 1, 1};
template<class BUI, class TRONG>
bool minimize(BUI &x, const TRONG y){
if(x > y){
x = y;
return true;
} else return false;
}
template<class BUI, class TRONG>
bool maximize(BUI &x, const TRONG y){
if(x < y){
x = y;
return true;
} else return false;
}
/* Author : Bui Nguyen Duc Trong, Luong Van Chanh High School for the gifted*/
/* Template is copied by Trong */
/** Losing in Provincial Contests **/
/** TRYING HARDER**/
/** ORZ **/
/* -----------------[ MAIN CODE GOES HERE ]----------------- */
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const int N = 4e5 + 10;
int n, q;
ll a[N];
vector<int> val;
int f[N];
int lst[N];
void solve(){
cin >> n;
for(int i = 1; i <= n; i++) cin >> a[i], a[i] += a[i - 1], val.push_back(a[i]);
val.push_back(0);
sort(all(val)); val.resize(unique(all(val)) - val.begin());
for(int i = 0; i <= n; i++) a[i] = lower_bound(all(val), a[i]) - val.begin();
memset(lst, -1, sizeof lst);
cin >> q;
while(q--){
int l, r; cin >> l >> r;
lst[a[l - 1]] = l - 1;
for(int i = l; i <= r; i++){
maximize(f[i], f[i - 1]);
if(lst[a[i]] > -1) maximize(f[i], f[lst[a[i]]] + 1);
lst[a[i]] = i;
}
cout << f[r] << '\n';
for(int i = l; i <= r; i++) lst[a[i]] = -1, f[i] = 0;
}
}
/*
10
1 2 -3 0 1 -4 3 2 -1 1
1
1 5
*/
signed main()
{
ios_base::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
const bool multitest = 0;
int tt = 1; if(multitest) cin >> tt;
while( tt-- ){
solve();
}
return 0;
}
