Submission #870024

#	Time	Username	Problem	Language	Result	Execution time	Memory
870024		Pannda	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	20 ms	4520 KiB

Main

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

const long long INF = (long long)3e18;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int n;
    cin >> n;
    vector<int> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

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

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

    long long ans = INF;
    for (int i = 0; i < n; i++) {
        ans = min(ans, max(pre[i], suf[i]));
    }
    cout << ans << '\n';
}

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