Submission #756715

#	Time	Username	Problem	Language	Result	Execution time	Memory
756715		dzdzx	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	0 / 100	1 ms	340 KiB

Main

#include <bits/stdc++.h>
#define ll long long
using namespace std;
int main(){
    ll n;
    cin>>n;
    ll a[n+1],b[n+1];
    for (int i=1;i<=n;i++){
        cin>>a[i];b[i]=a[i];
    }
    ll pref[n+1],suff[n+1];
    pref[1]=0;
    for (int i=2;i<=n;i++){
        pref[i]=max(pref[i-1],a[i-1]+1-a[i]);
        a[i]=max(a[i-1]+1,a[i]);
    }
    suff[n]=0;
    for (int i=n-1;i>=1;i--){
        suff[i]=max(suff[i+1],b[i+1]+1-b[i]);
        b[i]=max(b[i+1]+1,b[i]);
    }
    ll ans=-1;
    for (int i=1;i<=n;i++){
        if (ans==-1)ans=max(suff[i],pref[i]);
        ans=min(ans,max(suff[i],pref[i]));
    }
    cout<<ans;
}

• Subtask 1: 0 / 40
• Subtask 2: 0 / 60