#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdbool.h>
int main(int argc, char *argv[])
{
const int n = 100;
int perm[n];
double e = 0;
for (int z = 0; z < 30; z++)
{
for (int j = 0; j < n; j++)
{
perm[j] = j;
}
int k = n;
int idx;
int count = 0;
bool flag = 1;
int N = 100000000;
int j;
for (int i = 0; i < N; i++)
{
int tmp = perm[j];
perm[j] = perm[j + 1];
perm[j + 1] = tmp;
k += (perm[j] == j) + (perm[j + 1] == j + 1) - (perm[j] == j + 1) - (perm[j + 1] == j);
if (k == 0 && flag)
{
flag = 0;
idx = i;
}
else if (k == 0)
{
count++;
}
}
e += (double)(N-idx) / count;
printf("e = %f\n", (double)N
/ count
);
}
printf("średnie e = %f\n", e
/ 30);
}
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