题解 | #配置文件恢复#

'''
解题思路：
输入命令的前n个字符的匹配，并反馈输出相应的字符串
'''

def match(s1,s2):

    com_exe = [['reset','board'],\
               ['board','add'],\
               ['board ','delete'],\
               ['reboot ','backplane'],\
               ['backplane ','abort']]    

    j = 0
    k = 0
    for i in range(0,5):
        if s1 == com_exe[i][0][0:len(s1)] and s2 == com_exe[i][1][0:len(s2)]:
            j = i
            k += 1

    if k==1:
        return j
    else:
        return -1

#==================================================


while 1:
    try:

        com = 'reset'
        com_exe = [['reset','board'],\
                   ['board','add'],\
                   ['board ','delete'],\
                   ['reboot ','backplane'],\
                   ['backplane ','abort']]

        s = input().strip().split()
        #print(len(s))

        if len(s)==1:
            s = s[0]
            #print(s)
            if s == com[0:len(s)]:
                print('reset what')
            else:
                for i in range(0,5):
                    if s == com_exe[i][0][0:len(s)]:
                        print('unknown command')
                        break

        elif len(s)==2:     
            s1 = s[0]
            s2 = s[1]
            #print(s1,s2)

            t = match(s1,s2)
            #print('t=',t)

            if t == -1:
                print('unknown command')
            elif t == 0:
                print('board fault')
            elif t == 1:
                print('where to add')                
            elif t == 2:
                print('no board at all')            
            elif t == 3:
                print('impossible')            
            elif t == 4:
                print('install first')
                pass
        else:
            pass     


    except:
        break