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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.   int n,i,visited[1001]={0},matching[1001],length,s,cycles[100001],k=0;
  8.   cin>>n;
  9.   for (i=1;i<=n;i++) cin>>matching[i];
  10.   for (i=1;i<=n;i++) {
  11.       if (visited[i]==0) {
  12.           //cout<<i<<" ";
  13.           length++;s=matching[i];visited[i]=1;
  14.           //cout<<s<<" ";
  15.           while (s!=i) {
  16.              visited[s]=1;
  17.              //length++;
  18.              s=matching[s];
  19.              //cout<<s<<" ";
  20.           }
  21.         //cout<<endl;
  22.       }
  23.  
  24.   }
  25.   for (i=1;i<=1000;i++) visited[i]=0;
  26.   cout<<length<<endl;
  27.   for (i=1;i<=n;i++) {
  28.       if (visited[i]==0) {
  29.           cout<<i<<" ";
  30.           length++;s=matching[i];visited[i]=1;
  31.           //cout<<s<<" ";
  32.           while (s!=i) {
  33.              visited[s]=1;
  34.              //length++;
  35.              cout<<s<<" ";
  36.              s=matching[s]; 
  37.           }
  38.           cout<<s<<" ";
  39.         cout<<endl;
  40.       }
  41.  
  42.   }
  43.    return 0;
  44. }
Success #stdin #stdout 0s 3300KB
comments (?)
stdin
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8
2 4 5 1 7 6 3 8
stdout
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134514644
1 2 4 1 
3 5 7 3 
6 6 
8 8
https://ideone.com/OzaRj2
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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