View Compilation Error

0_0_37754543_4244.cpp: In function 'int check(ll)':
0_0_37754543_4244.cpp:38:14: error: 'a' was not declared in this scope
             {a
              ^
0_0_37754543_4244.cpp:41:17: error: expected '}' before 'else'
                 else
                 ^
0_0_37754543_4244.cpp: At global scope:
0_0_37754543_4244.cpp:45:5: error: expected unqualified-id before 'return'
     return 0;
     ^
0_0_37754543_4244.cpp:46:1: error: expected declaration before '}' token
 }
 ^