View Compilation Error

0_0_38522826_14610.cpp: In function 'int main()':
0_0_38522826_14610.cpp:61:30: error: 'a' was not declared in this scope
         memset(d,0,sizeof d);a
                              ^
0_0_38522826_14610.cpp:78:20: error: 'fb' was not declared in this scope
             if(fa!=fb) pre[fa]=fb;
                    ^