/in/foo.cc: In function 'int getzys(int, int)':
/in/foo.cc:28:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
            for(int k=0;k<p.size();k++) e[k]=0;              
                        ~^~~~~~~~~
/in/foo.cc:43:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
            for(int k=0;k<p.size();k++){
                        ~^~~~~~~~~