View Compilation Error

0_0_17252282_9301.cpp: In function 'int main()':
0_0_17252282_9301.cpp:64:44: error: 'j' was not declared in this scope
      gmax(f[i | 1 << v[num]][v[num]], f[i][j] + a[j] * a[v[num]]);
                                            ^
0_0_17252282_9301.cpp:70:35: error: 'j' was not declared in this scope
       gmax(f[i | 1 << k][k], f[i][j] + a[j] * a[k]);
                                   ^