/in/foo.cc: In function 'int main()':
/in/foo.cc:11:20: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[2000010]' [-Wformat=]
  scanf("%s%s",&a,&b);l1=strlen(a),l2=strlen(b);
               ~~   ^
/in/foo.cc:11:20: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[1000005]' [-Wformat=]