两种 1.能通过oj: 2.不能通过oj： #include<stdio.h>
int main() { int mouth ,year,day=31;
while(scanf("%d %d",&year,&mouth)!=EOF){ if(year>0&&mouth<=12){ if( mouth4|| mouth6||mouth9||mouth11){ day=30; } if( mouth2){ day=28+(year%40&&year%100!=0||year%400==0); } printf("%d\n",day);
} else printf(“ERROR\n”); } return 0; }
