Submission #222124

#	Time	Username	Problem	Language	Result	Execution time	Memory
222124		NONAME	새로운 문제 (COCI19_akvizna)	C++17	20 / 130	1594 ms	32444 KiB

Main

#include <bits/stdc++.h>
#include <time.h>
//#include <random>
#define sz(x) int(x.size())
#define in(x) freopen(x, "r", stdin)
#define out(x) freopen(x, "w", stdout)
#define N 100500
#define oo ll(1e16)
#define pii pair <int, int>
#define pll pair <ll, ll>
#define ft first
#define sd second
#define pb push_back
#define ppb pop_back
#define el '\n'
#define elf endl
#define base ll(1e9 + 7)
#define re return
#define nins 4294967295
using namespace std;
typedef long long ll;
typedef long double ld;

//mt19937 rnd(0);

int n, k;
ld f[1000][1000];

void solve() {
    cin >> n >> k;

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

    f[0][n] = 0;

    for (int kk = 0; kk < k; kk++)
    for (int i = 1; i <= n; i++)
    for (int j = 1; j <= i; j++) {
        if (f[kk][i] == -1)
            continue;

        f[kk + 1][i - j] = max(f[kk + 1][i - j], f[kk][i] + ld(j) / ld(i));
    }

    cout.precision(8); cout << fixed;

    cout << f[k][0];
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #ifdef _LOCAL
        in("input.txt");

        int t = 1;
//        cin >> t;
        for (int i = 1; i <= t; i++) {
            cout << "Test #" << i << elf;

            clock_t start_time = clock();

            solve();

            cerr.precision(4); cerr << fixed;
            cerr << elf;
            cerr << "Time :: " << ld(clock() - start_time) / CLOCKS_PER_SEC << elf;

            cout << elf;
        }
    #else
        int t = 1;
//        cin >> t;

        while (t--) {
            solve();
            cout << el;
        }
    #endif
}

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