foo.cc: In function 'int main()':
foo.cc:20:7: error: 'a' was not declared in this scope
    if(a[j]<a[m])
       ^
foo.cc:29:7: error: 'a' was not declared in this scope
  show(a[k+1],);
       ^
foo.cc:29:14: error: expected primary-expression before ')' token
  show(a[k+1],);
              ^
foo.cc:28:7: warning: unused variable 'sc' [-Wunused-variable]
  char sc[3][12];
       ^~
foo.cc: At global scope:
foo.cc:127:1: error: expected declaration before '}' token
 }
 ^

[Hydro](https://hydro.ac)提供评测服务