This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
#define endl '\n'
using namespace std;
const int MAXN=4e5+5;
const int INF=1e9+5;
int n,q;
//int a[MAXN];
long long a_pref_prev[MAXN];
//int nxt[MAXN];
//int previous[MAXN];
int prv[MAXN];
int nxt_l[MAXN], r[MAXN];
int ans[MAXN];
unordered_map<long long,int> m;
int main()
{
ios::sync_with_stdio(0);
cin.tie(0);
cout.tie(0);
cin>>n;
for(int i=1;i<=n;i++) cin>>a_pref_prev[i];
for(int i=1;i<=n;i++)
{
a_pref_prev[i]=a_pref_prev[i-1]+a_pref_prev[i];
}
for(int i=n;i>=0;i--)
{
if(!m[a_pref_prev[i]]) nxt_l[i]=INF;
else nxt_l[i]=m[a_pref_prev[i]];
m[a_pref_prev[i]]=i;
}
int ptr=n;
for(int i=n;i>=0;i--)
{
while(ptr>=nxt_l[i])
{
a_pref_prev[ptr]=i+1;
ptr--;
}
}
cin>>q;
for(int i=1;i<=q;i++)
{
cin>>nxt_l[i]>>r[i];
}
for(int lg=18;lg>=0;lg--)
{
for(int i=1;i<=n;i++) prv[i]=a_pref_prev[i];
for(int j=1;j<=lg;j++)
{
for(int i=n;i>0;i--)
{
if(prv[i]>1) prv[i]=prv[prv[i]-1];
else prv[i]=0;
}
}
for(int i=1;i<=q;i++)
{
if(nxt_l[i]<=r[i] && prv[r[i]]>=nxt_l[i])
{
ans[i]+=(1<<lg);
r[i]=prv[r[i]]-1;
}
}
}
for(int i=1;i<=q;i++) cout<<ans[i]<<endl;
return 0;
}
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