/in/foo.cc: In function 'int main()':
/in/foo.cc:7:18: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(y%4==0&&y%100!=0||y%400==0)
      |            ~~~~~~^~~~~~~~~~
/in/foo.cc:35:18: warning: 'x' may be used uninitialized [-Wmaybe-uninitialized]
   35 |                 d-=x;
      |                 ~^~~
/in/foo.cc:5:23: note: 'x' was declared here
    5 |         int y,m,d,h,k,x,ok=0;
      |                       ^