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- #include <bits/stdc++.h>
- using namespace std;
- string str,fin;
- long long n,a[11],i,x,k,p;
- int main()
- {
- cin >> n >> k;
- for(i=1;i<=n;i++) a[i]=i;
- while(1){
- p=0;
- for(i=1;i<=n;i++) if(a[i]==i)p++;
- if(a[i-1]<=k && a[i+1]<=k)x++;
- if(!next_permutation(a+1,a+1+n)) break;
- }
- cout << x;
- return 0;
- }
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