Submission #803037

#	Time	Username	Problem	Language	Result	Execution time	Memory
803037		starchan	Growing Vegetables is Fun 4 (JOI21_ho_t1)	C++17	100 / 100	21 ms	6996 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define in pair<int, int>
#define f first
#define s second
#define pb push_back
#define pob pop_back
#define INF (int)1e17
#define MX (int)3e5+5
#define fast() ios_base::sync_with_stdio(false); cin.tie(NULL)
signed main()
{
	fast();
	int n;
	cin >> n;
	vector<int> a(n);
	for(int i = 0; i < n; i++)
		cin >> a[i];
	for(int i = n-1; i > 0; i--)
		a[i]-=a[i-1];
	vector<int> pref(n), suff(n+1);
	pref[0] = 0;
	for(int i = 1; i < n; i++)
	{
		pref[i] = pref[i-1];
		if(a[i] > 0)
			continue;
		pref[i]+=(1-a[i]);
	}
	suff[n] = 0;
	for(int i = n-1; i > 0; i--)
	{
		suff[i] = suff[i+1];
		if(a[i] < 0)
			continue;
		suff[i]+=(1+a[i]);
	}
	int ans = INF;
	for(int k = 1; k <= n; k++)
		ans = min(max(pref[k-1], suff[k]), ans);
	cout << ans << "\n";
	return 0;
}	

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