Submission #102240

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
102240	2019-03-23 18:57:38	IvanC	새로운 문제 (COCI19_akvizna)	C++17	20 / 130	4 ms	896 KiB

Main

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#include <bits/stdc++.h>
using namespace std;
const int MAXN = 510;
int vis[MAXN][MAXN],N,K;
double dp[MAXN][MAXN];
double solve(int n,int k){
  if(vis[n][k]) return dp[n][k];
  vis[n][k] = 1;
  if(k == 0) return dp[n][k] = 0;
  double tot = 0;
  for(int i = 1;n - i >= k-1;i++){
    tot = max(tot, double(i)/double(n) + solve(n - i,k-1));
  }
  return dp[n][k] = tot;
}
int main(){
  cin >> N >> K;
  printf("%.9lf\n",solve(N,K));
 
 
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