Submission #960951

#	Time	Username	Problem	Language	Result	Execution time	Memory
960951		tudor_costin	Cat Exercise (JOI23_ho_t4)	C++11	41 / 100	90 ms	18612 KiB

Main

#include <bits/stdc++.h>
#define int long long
using namespace std;
const int Nmax=2e5+5;
int aint[4*Nmax];
int a[Nmax];
int pos[Nmax];
int n;
int sol=0;
void build(int nod,int l,int r)
{
    if(l==r)
    {
        aint[nod]=a[l];
        return;
    }
    int mid=(l+r)/2;
    build(2*nod,l,mid);
    build(2*nod+1,mid+1,r);
    aint[nod]=max(aint[2*nod],aint[2*nod+1]);
    return;
}
int query(int nod,int l,int r,int st,int dr)
{
    if(st<=l && r<=dr) return aint[nod];
    int mid=(l+r)/2;
    if(dr<=mid) return query(2*nod,l,mid,st,dr);
    if(mid<st) return query(2*nod+1,mid+1,r,st,dr);
    return max(query(2*nod,l,mid,st,mid),query(2*nod+1,mid+1,r,mid+1,dr));
}
int solve(int l,int r,int poz)
{
    int op1=0,op2=0;
    ///in stanga
    if(poz>l)
    {
        int newr=poz-1;
        int pozst=pos[query(1,1,n,l,newr)];
        op1=poz-pozst;
        op1+=solve(l,newr,pozst);
    }
    ///in dreapta
     if(poz<r)
    {
        int newl=poz+1;
        int pozdr=pos[query(1,1,n,newl,r)];
        op2=pozdr-poz;
        op2+=solve(newl,r,pozdr);
    }
    return max(op1,op2);
}
signed main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
    {
        cin>>a[i];
        pos[a[i]]=i;
    }
    build(1,1,n);
    int pozi=pos[query(1,1,n,1,n)];
    cout<<solve(1,n,pozi)<<'\n';
    return 0;
}

• Subtask 1: 7 / 7
• Subtask 2: 7 / 7
• Subtask 3: 7 / 7
• Subtask 4: 0 / 10
• Subtask 5: 20 / 20
• Subtask 6: 0 / 23
• Subtask 7: 0 / 26