日期的合法性

#include<stdio.h>
int main()
{
    int a,b,c;
    scanf("%d-%d-%d",&a,&b,&c);
    if(a < 0 || a > 3000 || c > 31 || c < 0 || b> 12 || b < 0 ) {printf("NO\n");}//判断范围
    else{if (b==1||b==3||b==5||b==7||b==8||b==8||b==10||b==12)
        {
        if(c>0&&c<=31){printf("YES");}else {printf("NO");}
        }
    else{if(b!=2){if(c>0&&c<=30){printf("YES");}else{printf("NO");}}
         else{if((a % 100 !=0&&a % 4 == 0)||a % 400 == 0){if(c>0&&c<=29){printf("YES");}else{printf("NO");}}
              else{if(c>0&&c<=28){printf("YES");}else{printf("NO");}}
             }
        }
        }
    
    return 0;
}