Submission #478035

#	Time	Username	Problem	Language	Result	Execution time	Memory
478035		Sohsoh84	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	28 ms	5028 KiB

Main

// ?
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<ll, ll> pll;

#define all(x)			(x).begin(),(x).end()
#define X			first
#define Y			second
#define sep			' '
#define endl			'\n'
#define debug(x)		cerr << #x << ": " <<  x << endl;

const ll MAXN = 1e6 + 10;
const ll INF = 1e18;

ll A[MAXN], pref[MAXN], suff[MAXN], n;

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	cin >> n;
	for (int i = 1; i <= n; i++) {
		cin >> A[i];
		pref[i] = pref[i - 1] + max(0ll, A[i - 1] - A[i] + 1);
	}

	for (int i = n; i > 0; i--)
		suff[i] = suff[i + 1] + max(0ll, A[i + 1] - A[i] + 1);

	ll ans = INF;
	for (int i = 1; i <= n; i++)
		ans = min(ans, max(pref[i], suff[i]));
	cout << ans << endl;
	return 0;
}

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