Submission #1010500

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010500		vjudge1	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	21 ms	8284 KiB

Main

#include <bits/stdc++.h>
using namespace std;
using ll = long long;
pair<ll,ll> r[212345],l[212345];
int main() {
    ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
    ll n,c=1e18;
    cin>>n;
    ll a[n];
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    for(int i=n-2;i>=0;i--){
        if(a[i]<=a[i+1]+r[i+1].second){
            r[i].second=r[i+1].second+max(0ll,a[i+1]-a[i]+1);
            r[i].first=r[i+1].first+r[i].second-r[i+1].second;
        }
        else{
            r[i].first=r[i+1].first;
            r[i].second=r[i+1].second;
        }
    }
    for(int i=1;i<n;i++){
        if(a[i]<=a[i-1]+l[i-1].second){
            l[i].second=l[i-1].second+max(0ll,a[i-1]-a[i]+1);
            l[i].first=l[i-1].first+l[i].second-l[i-1].second;
        }
        else{
            l[i].first=l[i-1].first;
            l[i].second=l[i-1].second;
        }
    }
    
    for(int i=0;i<n;i++){
        c=min(c,l[i].first+r[i].first-min(r[i].second,l[i].second));
    }
    cout<<c;
}

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