Submission #936742

#	Time	Username	Problem	Language	Result	Execution time	Memory
936742		vjudge1	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	22 ms	11148 KiB

Main

#include<bits/stdc++.h>

using namespace std;

typedef long long ll;

const int MAXN = 1e6 + 7;
const ll INF = 1e18 + 7;
const int logo = 20;
const int off = 1 << logo;

ll pf[MAXN], arr[MAXN], sf[MAXN];

void solve(){
	int n;
	cin >> n;
	for(int i=1; i<=n; i++) cin >> arr[i];
	for(int i=2; i<=n; i++){
		pf[i] = pf[i - 1];
		if(arr[i] <= arr[i - 1]) pf[i] += 1 + arr[i - 1] - arr[i];
	}
	
	for(int i=n-1; i; i--){
		sf[i] = sf[i + 1];
		if(arr[i] <= arr[i + 1]) sf[i] += 1 + arr[i + 1] - arr[i];
	}
	
	ll ans = INF;
	for(int i=1; i<=n; i++) ans = min(ans, max(pf[i], sf[i]));
	cout << ans << "\n";
}

int main(){
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	int tt = 1;
	//cin >> tt;
	while(tt--) solve();
	return 0;
}

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