제출 #786562

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
786562		Dan4Life	Seesaw (JOI22_seesaw)	C++17	0 / 100	1 ms	340 KiB

seesaw

#include <bits/stdc++.h>
using namespace std;
const int mxN = (int)1e3+10;
int n;
double a[mxN], pr[mxN], dp[mxN][mxN];
const double INF = 1e18;
 
double chk(double L){
	for(int i = 0; i <= n; i++){
		for(int j = 0; j <= n; j++){
			dp[i][j] = INF;
		}
	}
	for(int i = 0; i < n; i++)
		if(a[i]>=L) dp[i][i] = a[i];
	for(int l = 2; l <= n; l++){
		for(int i = 0; i+l-1 < n; i++){
			int j = i+l-1;
			if(pr[j+1]-pr[i] < L*(j-i+1)) continue;
			dp[i][j] = (pr[j+1]-pr[i])/(j-i+1);
			dp[i][j] = max(dp[i][j], min(dp[i+1][j],dp[i][j-1]));
		}
	}
	return dp[0][n-1];
}
 
int main()
{
	cin >> n;
	for(int i = 0; i < n; i++) cin >> a[i];
	sort(a,a+n); double ans = a[n-1]-a[0];
	for(int i = 0; i < n; i++) pr[i+1] = pr[i]+a[i];
	int cnt2 = 10;
	for(int i = max(0, n/2-5); i < n and cnt2--; i++){
		//cout << i << ": "; 
		int cnt = 10;
		for(int j = max(i,n/2); j < n and cnt--; j++){
			double L = (pr[j+1]-pr[i])/(j-i+1);
			ans = min(ans, chk(L)-L);
			//cout << chk(L)-L << " ";
		}//cout <<"\n";
	}
	cout << fixed << setprecision(9) << ans;
}

• Subtask 1: 0 / 1
• Subtask 2: 0 / 33
• Subtask 3: 0 / 33
• Subtask 4: 0 / 33