/in/foo.cc: In function 'int main()':
/in/foo.cc:10:17: warning: format '%ld' expects argument of type 'long int*', but argument 2 has type 'int*' [-Wformat=]
   scanf("%ld",&k);
               ~~^
/in/foo.cc:19:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(now>=del.size()){now=0;}
      ~~~^~~~~~~~~~~~