Submission #3968434


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

long long calcPermutation(long long x, long long y)
{
    long long ans = 1;
    for (long long i = 0; i < y; i++)
    {
        ans *= (x - i);
    }
    return ans;
}

double calcCombination(long long x, long long y)
{
    if (x < y)
    {
        return 0;
    }
    if ((x - y) < y)
    {
        y = x - y;
    }
    long long ans = calcPermutation(x, y);
    while (y > 0)
    {
        ans /= y;
        y--;
    }
    return (double)ans;
}

int main()
{
    long long N;
    cin >> N;

    long long C[N];
    for (long long i = 0; i < N; i++)
    {
        cin >> C[i];
    }

    long long D[N] = {};
    for (long long i = 0; i < N; i++)
    {
        for (long long j = 0; j < N; j++)
        {
            if (C[i] % C[j] == 0 && i != j)
            {
                D[i]++;
            }
        }
    }

    cout << endl;
    double ans;
    for (long long i = 0; i < N; i++)
    {
        for (long long j = 0; j < N; j++)
        {
            int count = 0;
            for (long long k = 0; k <= D[i] && k <= j; k += 2)
            {
                count += calcCombination(D[i], k) * calcCombination(N - 1 - D[i], j - k);
            }
            ans += count / calcCombination(N - 1, j);
        }
    }
    cout << fixed << setprecision(7) << ans / (double)N << endl;
}

Submission Info

Submission Time
Task C - コイン
User dhgrs
Language C++14 (GCC 5.4.1)
Score 100
Code Size 1413 Byte
Status AC
Exec Time 62 ms
Memory 256 KB

Judge Result

Set Name Sample Subtask1 Subtask2
Score / Max Score 0 / 0 99 / 99 1 / 1
Status
AC × 3
AC × 20
AC × 40
Set Name Test Cases
Sample sample_01.txt, sample_02.txt, sample_03.txt
Subtask1 subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask1_13.txt, subtask1_14.txt, subtask1_15.txt, subtask1_16.txt, subtask1_17.txt, subtask1_18.txt, subtask1_19.txt, subtask1_20.txt
Subtask2 subtask1_01.txt, subtask1_02.txt, subtask1_03.txt, subtask1_04.txt, subtask1_05.txt, subtask1_06.txt, subtask1_07.txt, subtask1_08.txt, subtask1_09.txt, subtask1_10.txt, subtask1_11.txt, subtask1_12.txt, subtask1_13.txt, subtask1_14.txt, subtask1_15.txt, subtask1_16.txt, subtask1_17.txt, subtask1_18.txt, subtask1_19.txt, subtask1_20.txt, subtask2_01.txt, subtask2_02.txt, subtask2_03.txt, subtask2_04.txt, subtask2_05.txt, subtask2_06.txt, subtask2_07.txt, subtask2_08.txt, subtask2_09.txt, subtask2_10.txt, subtask2_11.txt, subtask2_12.txt, subtask2_13.txt, subtask2_14.txt, subtask2_15.txt, subtask2_16.txt, subtask2_17.txt, subtask2_18.txt, subtask2_19.txt, subtask2_20.txt
Case Name Status Exec Time Memory
sample_01.txt AC 1 ms 256 KB
sample_02.txt AC 1 ms 256 KB
sample_03.txt AC 1 ms 256 KB
subtask1_01.txt AC 1 ms 256 KB
subtask1_02.txt AC 1 ms 256 KB
subtask1_03.txt AC 1 ms 256 KB
subtask1_04.txt AC 1 ms 256 KB
subtask1_05.txt AC 1 ms 256 KB
subtask1_06.txt AC 1 ms 256 KB
subtask1_07.txt AC 1 ms 256 KB
subtask1_08.txt AC 1 ms 256 KB
subtask1_09.txt AC 1 ms 256 KB
subtask1_10.txt AC 1 ms 256 KB
subtask1_11.txt AC 1 ms 256 KB
subtask1_12.txt AC 1 ms 256 KB
subtask1_13.txt AC 1 ms 256 KB
subtask1_14.txt AC 1 ms 256 KB
subtask1_15.txt AC 1 ms 256 KB
subtask1_16.txt AC 1 ms 256 KB
subtask1_17.txt AC 1 ms 256 KB
subtask1_18.txt AC 1 ms 256 KB
subtask1_19.txt AC 1 ms 256 KB
subtask1_20.txt AC 1 ms 256 KB
subtask2_01.txt AC 1 ms 256 KB
subtask2_02.txt AC 2 ms 256 KB
subtask2_03.txt AC 2 ms 256 KB
subtask2_04.txt AC 5 ms 256 KB
subtask2_05.txt AC 14 ms 256 KB
subtask2_06.txt AC 5 ms 256 KB
subtask2_07.txt AC 4 ms 256 KB
subtask2_08.txt AC 62 ms 256 KB
subtask2_09.txt AC 62 ms 256 KB
subtask2_10.txt AC 60 ms 256 KB
subtask2_11.txt AC 43 ms 256 KB
subtask2_12.txt AC 43 ms 256 KB
subtask2_13.txt AC 8 ms 256 KB
subtask2_14.txt AC 46 ms 256 KB
subtask2_15.txt AC 44 ms 256 KB
subtask2_16.txt AC 9 ms 256 KB
subtask2_17.txt AC 60 ms 256 KB
subtask2_18.txt AC 3 ms 256 KB
subtask2_19.txt AC 9 ms 256 KB
subtask2_20.txt AC 62 ms 256 KB