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- #include <bits/stdc++.h>
- using namespace std;
- ifstream fin("vot1.in");
- ofstream fout("vot1.out");
- int n, sol, f[1005], d[1005];
- bitset<1005> viz;
- vector<int> v;
- int main()
- {
- fin >> n;
- for(int i=1; i<=n; i++)
- {
- fin >> f[i];
- d[f[i]]++;
- }
- for(int j=1; j<=n; j++)
- {
- int i=j;
- while(!d[i])
- {
- viz[i]=1;
- sol++;
- d[f[i]]--;
- i=f[i];
- }
- }
- fout << n-sol << "\n";
- for(int i=1; i<=n; i++)
- if(!viz[i])
- fout << i << " ";
- return 0;
- }
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