题解 | #24点游戏算法#

import itertools
num = input().split(' ')

def find(num):
    possible = 'false'
    for nums in itertools.permutations(num):
        for one in '+-*/':
            for two in '+-*/':
                for three in '+-*/':
                    cmd = nums[0]+one+nums[1]+two+nums[2]+three+nums[3]
                    for i in [0,2,4,6]:
                        cmd_left = cmd[0:i]+'('+cmd[i::]
                        for j in [len(cmd_left)-2*k for k in range(4)]:
                            cmd_right = cmd_left[0:j] + ')' + cmd_left[j::]
                            try:
                                r = eval(cmd_right)
                                if r == 24:
                                    possible = 'true'
                                    return possible
                            except:
                                pass
    return possible
print(find(num))