Submission #372222

#	Time	Username	Problem	Language	Result	Execution time	Memory
372222		dolphingarlic	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++14	100 / 100	33 ms	5120 KiB

Main

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

ll a[200002], pref[200002], suff[200002];

int main() {
	cin.tie(0)->sync_with_stdio(0);
	int n;
	cin >> n;
	for (int i = 1; i <= n; i++) cin >> a[i];
	for (int i = 1; i <= n; i++) pref[i] = pref[i - 1] + max(0ll, a[i - 1] - a[i] + 1);
	for (int i = n; i; i--) suff[i] = suff[i + 1] + max(0ll, a[i + 1] - a[i] + 1);
	ll ans = LLONG_MAX;
	for (int i = 1; i < n; i++)
		ans = min(ans, max(pref[i], suff[i + 1]) + (a[i] + pref[i] == a[i + 1] + suff[i + 1]));
	cout << ans;
	return 0;
}

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