foo.c: In function 'main':
foo.c:11:14: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(year%4==0&&year%100!=0||year%400==0){
     ~~~~~~~~~^~~~~~~~~~~~~
foo.c:9:2: warning: ignoring return value of 'scanf', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d-%d-%d",&year,&month,&day);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

[Hydro](https://hydro.ac)提供评测服务