/in/foo.cc: In function 'int main()':
/in/foo.cc:7:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(x%4==0&&x%100!=0||x%400==0)
      |            ~~~~~~^~~~~~~~~~
/in/foo.cc:8:23: error: 'YES' was not declared in this scope
    8 |                 cout<<YES;
      |                       ^~~
/in/foo.cc:10:23: error: 'NO' was not declared in this scope
   10 |                 cout<<NO<<endl;
      |                       ^~