/in/foo.cc: In function 'int main()':
/in/foo.cc:16:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n;++i)
              ~^~~
/in/foo.cc:18:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=n;++i){
              ~^~~
/in/foo.cc:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int q=0;q<=cost[i]-1;++q){
               ~^~~~~~~~~~~
/in/foo.cc:22:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int q=cost[i];q<=money;++q){
                     ~^~~~~~~