：#include void main(){int year,month, days; cin>>year>>month; switch(month) {case 1: case 3: case 5: case 7: case 8: case 10: case 12:days=31;break; case 4: case 6: case 9: case 11: days=30;break; case 2: if(year%400==0 || year%4==0 &&year%100!=0) days=29; else days=28; }cout<
