/in/foo.cc: In function 'int main()':
/in/foo.cc:15:26: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[110]' [-Wformat=]
 while(~scanf("%s%s",&a,&b))
                          ^
/in/foo.cc:15:26: warning: format '%s' expects argument of type 'char*', but argument 3 has type 'char (*)[110]' [-Wformat=]