/in/foo.cc: In function 'node* build(int, int)':
/in/foo.cc:68:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'void splay(node*, node*)':
/in/foo.cc:101:3: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
   else rotate(y); rotate(x);
   ^~~~
/in/foo.cc:101:19: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
   else rotate(y); rotate(x);
                   ^~~~~~