/in/foo.cc:30:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
 main(){
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:31:20: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'long long int*' [-Wformat=]
  scanf("%d%d",&a,&b);
                    ^
/in/foo.cc:31:20: warning: format '%d' expects argument of type 'int*', but argument 3 has type 'long long int*' [-Wformat=]