View Compilation Error

0_0_37852106_9478.cpp: In function 'int main()':
0_0_37852106_9478.cpp:45:26: error: 'a' was not declared in this scope
                     if(d[a][b]-1>6) 
                          ^
0_0_37852106_9478.cpp:45:29: error: 'b' was not declared in this scope
                     if(d[a][b]-1>6) 
                             ^