dict1={"I":1,"V":5,"X":10,"L":50,"C":100,"D":500,"M":1000}

dict2=dict(zip(dict1.values(),dict1.keys()))

appear=""

while True:

    number=input("").split(" ")

    if number == ["#"]:

        break

    n1=list(number[0])

    n2=list(number[1])

    add1=0

    add2=0

    for i in range (len(n1)-1):

        if dict1[n1[i]]<dict1[n1[i+1]]:

            add1-=dict1[n1[i]]

        else:

            add1+=dict1[n1[i]]

    add1+=dict1[n1[len(n1)-1]]

    for i in range (len(n2)-1):

        if dict1[n2[i]]<dict1[n2[i+1]]:

            add2-=dict1[n2[i]]

        else:

            add2+=dict1[n2[i]]

    add2+=dict1[n2[len(n2)-1]]

    if add1>=add2:

        add3=add1-add2

    else:

        add3=add2-add1

    if add3==0:

        print("ZERO")

    else:

        time=0

        while True:

            if add3>=1000:

                time=add3//1000

                add3=add3%1000

            else:

                break

        while True: 

            if time>0:

                time-=1

                appear+="M"

            else:

                break

        time=0

        while True:

            if add3>=100:

                time=add3//100

                add3=add3%100

            else:

                break

        while True:

            if time ==4:

                appear+="CD"

                time-=4

            if time == 9:

                appear+="CM"

                time-=9

            if time>=5:

                time-=5

                appear+="D"

            if time>0:

                time-=1

                appear+="C"

            else:

                break

        time=0

        while True:

            if add3>=10:

                time=add3//10

                add3=add3%10

            else:

                break

        while True:

            if time ==4:

                appear+="XL"

                time-=4

            if time == 9:

                appear+="XC"

                time-=9

            if time>=5:

                time-=5

                appear+="C"

            if time>0:

                time-=1

                appear+="X"

            else:

                break

        while True:

            if add3 ==4:

                appear+="IV"

                add3-=4

            if add3 == 9:

                appear+="IX"

                add3-=9

            if add3>=5:

                add3-=5

                appear+="V"

            if add3>0:

                add3-=1

                appear+="I"

            else:

                break

    print(appear)

1. 你的appear沒有在每個測資間清空，會變得越來越長。你可以把appear=0放在while迴圈裡面

2.

這裡應該是appear+="L"

謝謝，已通過。