This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
vector<int> v;
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(NULL);
int N, M;
cin >> N >> M;
for (int i = 1; i <= 2*N; i++) v.push_back(i);
int resp = 0;
do
{
bool b = true;
for (int i = 0; i < 2*N; i++)
{
for (int j = 0; j < 2*N; j++)
{
if (abs(v[j] - v[i]) != N) continue;
if ((j - i) % M == 0) b = false;
}
}
resp += b;
}
while (next_permutation(v.begin(), v.end()));
cout << resp;
}
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