/in/foo.cc: In function 'LL ms(int, int)':
/in/foo.cc:10:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1;
          ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:35:1: warning: this 'else' clause does not guard... [-Wmisleading-indentation]
 else  cout<<"NO "<<ans<<endl;
 ^~~~
/in/foo.cc:36:2: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'else'
  return 0;
  ^~~~~~