题解 | #24点运算#

import sys,itertools
table1 = {'A':1,'2':2,'3':3,'4':4,'5':5,'6':6,'7':7,'8':8,'9':9,'10':10,'J':11,'Q':12,'K':13}
table2 = {v:K for K,v in table1.items()}
for line in sys.stdin:
    a = line.strip().split(" ")
    list1 = []
    if 'joker' in a or 'JOKER' in a:
        print("ERROR")
        sys.exit()
    for i in a:
        list1.append(table1[i])
    for e in itertools.permutations(list1,4):
        for fh1 in ['+','-','*','/']:
            for fh2 in ['+','-','*','/']:
                for fh3 in ['+','-','*','/']:
                    resault1 = f'{table2[e[0]]}{fh1}{table2[e[1]]}{fh2}{table2[e[2]]}{fh3}{table2[e[3]]}'
                    resault2 = f'(({e[0]}{fh1}{e[1]}){fh2}{e[2]}){fh3}{e[3]}'
                    re1 = eval(resault2)
                    if re1 == 24.0:
                        print(resault1)
                        sys.exit()
    else:
        print("NONE")