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- //задача Нерухомі точки
- #include <bits/stdc++.h>
- using namespace std;
- int a[1007];
- int main ()
- {
- int n, k, t, ans=0;
- cin>>n>>k;
- for (int i=0; i<n; i++) a[i]=i+1;
- while(next_permutation(a, a+n)!=false)
- {
- t=0;
- for (int i=0; i<n; i++) if (a[i]==i+1) t++;
- if (t==k) ans++;
- }
- cout<<ans;
- return 0;
- }
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