/in/foo.cc: In function 'int main()':
/in/foo.cc:31:20: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[300]' [-Wformat=]
  scanf("%s%s",&a,&b);
                    ^
/in/foo.cc:31:20: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[1000010]' [-Wformat=]