/in/foo.cc: In function 'int main()':
/in/foo.cc:55:21: warning: unused variable 'z' [-Wunused-variable]
     for(int i=1,x,y,z;i<=m;i++)
                     ^
/in/foo.cc:68:28: warning: unused variable 'tot' [-Wunused-variable]
     int minn=LONG_LONG_MAX,tot=0;
                            ^~~