Submission #581006

#	Time	Username	Problem	Language	Result	Execution time	Memory
581006		AngusWong	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	97 ms	5212 KiB

Main

#include <bits/stdc++.h>
#define ll long long
using namespace std;

ll n, a[200001], l[200001], r[200001], ans=1e18;

int main() {
    cin >> n;
    for (int i=1; i<=n; i++) cin >> a[i];
    for (int i=2; i<=n; i++){
        if (a[i]<=a[i-1]) l[i]=a[i-1]-a[i]+1;
    }
    for (int i=n-1; i>=1; i--){
        if (a[i]<=a[i+1]) r[i]=a[i+1]-a[i]+1;
    }
    for (int i=2; i<=n; i++) l[i]+=l[i-1];
    for (int i=n-1; i>=1; i--) r[i]+=r[i+1];
    for (int i=1; i<=n; i++) ans=min(ans, max(l[i], r[i]));
    cout << ans << "\n";
}

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