제출 #222114

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
222114		kartel	새로운 문제 (COCI19_akvizna)	C++14	20 / 130	1597 ms	36728 KiB

Main

#include <bits/stdc++.h>
#define in(x) freopen(x,"r",stdin)
#define out(x) freopen(x,"w",stdout)
#define F first
#define S second
#define pb push_back
#define M ll(998244353)
#define inf ll(2e9+7)
#define N ll(200500)
#define sz(x) x.size()
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define el '\n'
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;

//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;
//typedef tree <ll, null_type, less_equal <ll>, rb_tree_tag, tree_order_statistics_node_update> os;

ld f[3001][3001];
ll n, k, i, j, kol;

int main()
{
//    in("input.txt");
//    out("output.txt");

    ios_base::sync_with_stdio(false);
    iostream::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> k;

    f[n][0] = 0;
    for (i = 1; i <= k; i++) f[n][i] = -1e18;

    for (i = n; i > 0; i--)
      for (j = 0; j <= k; j++)
        for (kol = 1; kol <= i; kol++) f[i - kol][j + 1] = max(f[i - kol][j + 1], f[i][j] + ld(kol) / ld(i));

    cout << setprecision(8) << fixed << f[0][k];
}

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