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  1. #include <iostream>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. int main()
  6.   {
  7.    char tb[]="1234567";
  8.    for(unsigned nr=0;;++nr)
  9.      {
  10.       unsigned NR=0,fact=1,mul=0;
  11.       for(char *w=tb+5;w>=tb;--w)
  12.         {
  13.          unsigned less=0;
  14.          for(char *v=tb+6;v>w;--v) if(*v<*w) ++less;
  15.          NR+=less*(fact*=(++mul));
  16.         }
  17.       if(NR!=nr) cout<<NR<<"!="<<nr<<endl; // only if unsigned overflow
  18.       if(!next_permutation(tb,tb+7)) break;
  19.      }
  20.    cout<<"END"<<endl;
  21.    return 0;
  22.   }
Success #stdin #stdout 0s 2896KB
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Standard input is empty
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END
https://ideone.com/XReGTI
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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