题解 | #24点游戏算法#

import itertools
while True:
    try:
        nums_list = list(map(int,input().split(' ')))
        n = len(nums_list)
        order = ['+','-','*','/']
        for nums in itertools.permutations(nums_list):
            for i in order:
                for j in order:
                    for k in order:
                        result = eval('{0}{1}{2}'.format(nums[0],i,nums[1]))
                        result = eval('{0}{1}{2}'.format(result,j,nums[2]))
                        result = eval('{0}{1}{2}'.format(result,k,nums[3]))
                        if result == 24:
                            print("true")
                            raise ValueError
        else:
            print('false')
    except:
        break