Submission #783264

#	Time	Username	Problem	Language	Result	Execution time	Memory
783264		borisAngelov	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	22 ms	6168 KiB

Main

#include <bits/stdc++.h>

using namespace std;

const int maxn = 200005;

int n;

int a[maxn];

long long preffix[maxn];
long long suffix[maxn];

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

int main()
{
    fastIO();

    cin >> n;

    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i];
    }

    for (int i = 2; i <= n; ++i)
    {
        preffix[i] = preffix[i - 1] + max(0, a[i - 1] - a[i] + 1);
    }

    for (int i = n - 1; i >= 1; --i)
    {
        suffix[i] = suffix[i + 1] + max(0, a[i + 1] - a[i] + 1);
    }

    long long ans = (1ll << 62);

    for (int i = 1; i <= n; ++i)
    {
        ans = min(ans, max(preffix[i], suffix[i]));
    }

    cout << ans << endl;

    return 0;
}

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