4. 输入年月日并判断输出这是当年的第几天。nian=int(input("年："))yue=int(input("月："))ri=int(input("日："))list=[31,60,91,121,152,182,213,244,274,305,335,366]if yue==1: count=riif (nian%4==0 and nian%100!=0)or nian%400==0: if yue>1 and yue<13: count=list[yue-2]+rielse: if yue>1 and yue<13: count=list[yue-2]+yue-1print("第"+str(count)+"天")