/in/foo.cc:4:1: error: expected ',' or ';' before 'int'
 int n,t;
 ^~~
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:7:9: error: 'n' was not declared in this scope
  if(sum>n)
         ^
/in/foo.cc:10:2: error: expected primary-expression before 'else'
  else{
  ^~~~
/in/foo.cc:10:2: error: return-statement with a value, in function returning 'void' [-fpermissive]
/in/foo.cc:10:2: error: expected ';' before 'else'
/in/foo.cc:10:2: error: 'else' without a previous 'if'
/in/foo.cc:12:11: error: expected primary-expression before ',' token
   dfs(num+,sum);
           ^
/in/foo.cc:15:1: error: a function-definition is not allowed here before '{' token
 {
 ^
/in/foo.cc:29:1: error: expected '}' at end of input
 }
 ^