Submission #744794

#	Time	Username	Problem	Language	Result	Execution time	Memory
744794		Andrei_ierdnA	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	41 ms	6952 KiB

Main

#include <iostream>
#include <iomanip>

using namespace std;

#define INF 1000000000000000LL

long long n, i, a[200100], prefval[200100], sufval[200100], ans;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n;
    for (i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    prefval[1] = 0;
    for (i = 2; i <= n; i++)
    {
        prefval[i] = prefval[i-1];
        if (a[i] <= a[i-1])
        {
            prefval[i] += (a[i-1] - a[i] + 1);
        }
    }
    sufval[n] = 0;
    for (i = n-1; i >= 1; i--)
    {
        sufval[i] = sufval[i+1];
        if (a[i] <= a[i+1])
        {
            sufval[i] += (a[i+1] - a[i] + 1);;
        }
    }
    ans = max(prefval[1], sufval[1]);
    for (i = 2; i <= n; i++)
    {
        ans = min(ans, max(prefval[i], sufval[i]));
    }
    cout << ans;
    return 0;
}

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