Submission #646892

#	Time	Username	Problem	Language	Result	Execution time	Memory
646892		DobromirAngelov	Sum Zero (RMI20_sumzero)	C++14	0 / 100	3 ms	468 KiB

sumzero

#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];
pair<long long,int> pref[MAXN];
//int nxt[MAXN];
int previous[MAXN];
int prv[MAXN];
int nxt_l[MAXN], r[MAXN];
int ans[MAXN];
//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>>pref[i].first;

for(int i=1;i<=n;i++)
{
    pref[i].first=pref[i-1].first+pref[i].first;
    pref[i].second=i;
}
sort(pref+1,pref+n+1);
for(int i=1;i<=n;i++) nxt_l[i]=INF;
for(int i=1;i<=n;i++)
{
    if(pref[i].first==pref[i+1].first) nxt_l[pref[i].second]=pref[i+1].second;

}
/*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])
    {
        previous[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]=previous[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;
}

• Subtask 1: 0 / 22
• Subtask 2: 0 / 39
• Subtask 3: 0 / 39