Submission #258050

#	Time	Username	Problem	Language	Result	Execution time	Memory
258050		leaked	새로운 문제 (COCI19_akvizna)	C++14	20 / 130	1600 ms	2976 KiB

Main

#include<bits/stdc++.h>
using namespace std;
//#include<ext/pb_ds/assoc_container.hpp>
//#include<ext/pb_ds/tree_policy.hpp>
//
//    #pragma GCC optimize("unroll-loops")
//    #pragma GCC optimize("Ofast")
//    #pragma GCC optimize("-O3")
//    #pragma GCC optimize("no-stack-protector")
//    #pragma GCC optimize("fast-math")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx")
//#define LOCAL
#define sim template < class c
#define ris return * this
#define dor > debug & operator <<
#define eni(x) sim > typename \
  enable_if<sizeof dud<c>(0) x 1, debug&>::type operator<<(c i) {
sim > struct rge { c b, e; };
sim > rge<c> range(c i, c j) { return rge<c>{i, j}; }
sim > auto dud(c* x) -> decltype(cerr << *x, 0);
sim > char dud(...);
struct debug {
#ifndef LOCAL
~debug() { cerr << endl; }
eni(!=) cerr << boolalpha << i; ris; }
eni(==) ris << range(begin(i), end(i)); }
sim, class b dor(pair < b, c > d) {
  ris << "(" << d.first << ", " << d.second << ")";
}
sim dor(rge<c> d) {
  *this << "[";
  for (auto it = d.b; it != d.e; ++it)
	*this << ", " + 2 * (it == d.b) << *it;
  ris << "]";
}
#else
sim dor(const c&) { ris; }
#endif
};
#define imie(...) " [" << #__VA_ARGS__ ": " << (__VA_ARGS__) << "] "
#define fi first
#define f first
#define se second
#define s second
#define vi_a vector<int>a;
#define p_b push_back
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ll long long
typedef unsigned long long ull;
////////////////////////////////???????????????CHECK THIS OUT???????????????//////////////////////////////
#define ld long double
#define pll pair<ll,ll>
#define pii pair<int,int>
#define m_p make_pair
#define fast_io cin.tie(0);cout.tie(0);ios_base::sync_with_stdio(0);
#define all(x) x.begin(),x.end()
#define getfiles    ifstream cin("input.txt");ofstream cout("output.txt");
#define pw(x) (1ll << x)
#define sz(x) (int)x.size()
#define endl "\n"
#define rall(x) x.rbegin(),x.rend()
#define len(a) (ll)a.size()
#define rep(x,l,r) for(ll x=l;x<r;x++)

//using namespace __gnu_pbds;
ld eps = (ld)1 / 1e6;
const ld pi=3.14159265359;
ll inf = 1e18,mod1=1e9+7;
ll sqr(ll a) { return a * a; }
ll qb(ll a) { return a * a * a; }
void umin(ld &a,ld b){a=min(a,b);}
void umax(ld &a,ld b){a=max(a,b);}
bool is_prime(ll val){for(ll i=2;i<=sqrt(val);i++)if(val%i==0)return 0; return 1;}
ll gcd(ll a, ll b) { return !a ? b : gcd(b % a, a); }
ll binpow(ll a, ll b, ll mod) { return b ? (b % 2 ? (a * (sqr(binpow(a, b / 2, mod)) % mod)) % mod : sqr(binpow(a, b / 2, mod)) % mod) : 1; }
ll binmult(ll a, ll b, ll mod) { return b ? (b % 2 ? (2 * binmult(a, b / 2, mod) + a) % mod : (2 * binmult(a, b / 2, mod)) % mod) : 0; }
/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
const ll tx[4]={0,1,-1,1};
const ll ty[4]={-1,0,1,1};
const char rev_to[4]={'E','W','N','S'};
const int M=1e9;
const int N=3e3+2;
const int ppp=73;
const int lg=19;
const int OPEN=1;
const int CLOSE=0;
//typedef tree<ll,null_type,less<ll>,rb_tree_tag,tree_order_statistics_node_update> st;
auto rnd=bind(uniform_int_distribution<ll>(1,N),mt19937(time(0)));
void bad(){
    cout<<"NE";
    exit(0);
}
ld f[N][N];
signed main()
{
//    freopen("in.txt","r",stdin);
    fast_io;
    ///макс по высоте
//    memset(f,-1e9,sizeof(f));
    f[0][0]=0;
    int n,k;
    cin>>n>>k;
    for(int r=0;r<k;r++){
        for(int choosed=r;choosed<n;choosed++){
            for(int to_choose=0;to_choose<=n-choosed+k-r-1;to_choose++){
                umax(f[r+1][choosed+to_choose],(ld)(f[r][choosed]+((ld)to_choose/(n-choosed))));
//                debug()<<imie(f[r][choosed]+((ld)to_choose/(n-choosed)));
            }
//            debug()<<imie(f[r][choosed])<<imie(choosed);
        }
    }
    ld ans=0;
    for(int r=0;r<=k;r++){
        for(int choosed=0;choosed<=n;choosed++){
            umax(ans,f[r][choosed]);
        }
    }
    cout<<fixed<<setprecision(9)<<ans;
    return 0;
}
/*

*/

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