Submission #1171412

#	Time	Username	Problem	Language	Result	Execution time	Memory
1171412		chikien2009	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	12 ms	4236 KiB

Main

#include <bits/stdc++.h>

using namespace std;

void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, a[200000];
long long pre[200000], suf[200000], res = 1e18;

int main()
{
    setup();

    cin >> n;
    for (int i = 0; i < n; ++i)
    {
        cin >> a[i];
        pre[i] = (i == 0 ? 0 : pre[i - 1] + max(0, a[i - 1] - a[i] + 1));
    }
    for (int i = n - 1; i >= 0; --i)
    {
        suf[i] = (i == n - 1 ? 0 : suf[i + 1] + max(0, a[i + 1] - a[i] + 1));
        res = min(res, max(pre[i], suf[i]));
    }
    cout << res;
    return 0;
}

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