/in/foo.cc: In function 'int main()':
/in/foo.cc:14:9: warning: unused variable 'root' [-Wunused-variable]
     int root=1;
         ^~~~
/in/foo.cc:29:13: warning: 'temp' may be used uninitialized in this function [-Wmaybe-uninitialized]
         int temp;
             ^~~~