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#includevoid main(){ int year,month; scanf("%d%d",&year,&month); switch(month) { case 1: case 3: case 5: case 7: case 8: case 10: case 12:printf("31\n");break; case 2: { if((year % 4 == 0 && year % 100 != 0) || year % 400 == 0) printf("29\n"); else printf("28\n"); break; } case 4: case 6: case 9: case 11:printf("30\n");break; default:printf("-1");break; }}
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