Mã chấm: 268853

Main.cc:57:2: error: expected unqualified-id before ‘return’
  return sum;
  ^~~~~~
Main.cc:58:1: error: expected declaration before ‘}’ token
 }
 ^
Main.cc: In function ‘int main()’:
Main.cc:14:7: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
Main.cc: In function ‘void input(char*, int)’:
Main.cc:26:8: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result]
   scanf("%c", &a[i]);
   ~~~~~^~~~~~~~~~~~~