Submission #1280418

#	Time	Username	Problem	Language	Result	Execution time	Memory
1280418		hoangtien69	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	19 ms	5120 KiB

Main

#include<bits/stdc++.h>
using namespace std;
const int MAXN = 2e5 + 5;
#define int long long

int n;
int a[MAXN];
int pre[MAXN];
int suf[MAXN];
int ans_pre[MAXN];
int ans_suf[MAXN];

signed main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    for (int i = 2; i <= n; i++)
    {
        pre[i] = pre[i - 1] + max(0LL, a[i - 1] - a[i] + 1);
    }
    for (int i = n - 1; i >= 1; i--)
    {
        suf[i] = suf[i + 1] + max(0LL, a[i + 1] - a[i] + 1);
    }
    int ans = LLONG_MAX;
    for (int i = 1; i <= n; i++)
    {
        ans = min(ans, max(pre[i], suf[i]));
    }
    cout << ans;
}

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