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  1. #include <string>
  2. #include <iostream>
  3. #include <iomanip>
  4. #include <algorithm>
  5.  
  6. using namespace std;
  7.  
  8.  
  9. int main(int argc, const char * argv[])
  10. {
  11.     int total = 0, bad = 0;
  12.     string s = "0123456789";
  13.     do {
  14.         if (s[0] < '3' || s[1] < '3' || s[2] < '3' || s[3] < '3') bad++;
  15.         total++;
  16.     } while(next_permutation(s.begin(),s.end()));
  17.     cout << double(bad)/total << endl;
  18. }
  19.  
Success #stdin #stdout 0.02s 4400KB
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stdin
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Standard input is empty
stdout
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0.833333
https://ideone.com/SXSPKa
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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