/in/foo.cc: In function 'bool leap(int)':
/in/foo.cc:5:11: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(x%4==0&&x%100!=0||x%400==0)return true;
     ~~~~~~^~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:15:11: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
  cout<<ans;
           ^