/in/foo.cc: In function 'int leap(long long int, long long int)':
/in/foo.cc:9:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   if(i%4==0&&i%100!=0||i%400==0)
      ~~~~~~^~~~~~~~~~
/in/foo.cc:11:9: warning: 'n' may be used uninitialized in this function [-Wmaybe-uninitialized]
  return n;   
         ^