/in/foo.cc: In function 'int main()':
/in/foo.cc:7:6: warning: unused variable 'cnt' [-Wunused-variable]
  int cnt=0;
      ^~~
/in/foo.cc:10:3: warning: 'x' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if(i!=x)
   ^~
/in/foo.cc:18:9: warning: 'k' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<k;
         ^