Submission #912266

#	Time	Username	Problem	Language	Result	Execution time	Memory
912266		andrei_iorgulescu	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	24 ms	8608 KiB

Main

#include <bits/stdc++.h>

using namespace std;

#define int long long

int n,a[200005],d[200005];
int pref[200005],suf[200005];

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    cin >> n;
    for (int i = 1; i <= n; i++)
        cin >> a[i];
    for (int i = 1; i < n; i++)
        d[i] = a[i + 1] - a[i];
    for (int i = 1; i < n; i++)
        pref[i] = pref[i - 1] + max(-d[i] + 1,0ll);
    for (int i = n - 1; i >= 1; i--)
        suf[i] = suf[i + 1] + max(d[i] + 1,0ll);
    int ans = 1e18;
    for (int k = 1; k <= n; k++)
        ans = min(ans,max(pref[k - 1],suf[k]));
    cout << ans;
    return 0;
}

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