Submission #1154724

#	Time	Username	Problem	Language	Result	Execution time	Memory
1154724		mingga	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++20	100 / 100	27 ms	4936 KiB

Main

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

#define fi first
#define se second
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
#define ln '\n'
#define int long long

const int N = 2e5 + 7;
const int inf = 2e18;
int n, a[N], rig[N], d[N];

signed main() {
    cin.tie(0) -> sync_with_stdio(0);
    cin >> n;
    for(int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    int ans = inf;
    for(int i = 1; i <= n; i++) {
        d[i] = a[i] - a[i - 1];
//        cerr << d[i] << ' ';
    }
//    cerr << ln;
    for(int i = n; i > 0; i--) {
        rig[i] = rig[i + 1];
        if(d[i] >= 0) rig[i] += d[i] + 1;
    }
    int cur = 0;
    for(int i = 1; i <= n; i++) {
        if(d[i] <= 0) cur += 1 - d[i];
        ans = min(ans, max(cur, rig[i + 1]));
    }
    cout << ans << ln;
}

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