Submission #1120433

#	Time	Username	Problem	Language	Result	Execution time	Memory
1120433		Luvidi	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	36 ms	8664 KiB

Main

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

#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define fs first
#define sc second
#define pb push_back

void solve(){
    int n;
    cin>>n;
    ll a[n+1],d[n+1];
    for(int i=0;i<n;i++)cin>>a[i];
    a[n]=0;
    d[0]=a[0];
    for(int i=1;i<=n;i++)d[i]=a[i]-a[i-1];
    ll pre[n],suf[n];
    for(int i=0;i<=n;i++){
        pre[i]=max(0LL,1-d[i]);
        if(i)pre[i]+=pre[i-1];
    }
    for(int i=n;i>-1;i--){
        suf[i]=max(0LL,d[i]+1);
        if(i<n)suf[i]+=suf[i+1];
    }
    ll ans=1e18;
    for(int i=0;i<n;i++)ans=min(ans,max(pre[i],suf[i+1]));
    cout<<ans<<'\n';
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);

    solve();
}

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