题解 | #24点游戏算法#

import itertools
def dfs(nums):
    try:
        n = len(nums)
        if n==1 and nums[0]==24:
            return True
        else:
            for x, y in itertools.permutations(nums, 2):
                nums.remove(x)
                nums.remove(y)
                if dfs(nums+[x+y]):
                    return True
                if dfs(nums+[x-y]):
                    return True
                if dfs(nums+[x*y]):
                    return True
                if dfs(nums+[x/y]):
                    return True
                nums.append(x)
                nums.append(y)
        return False
    except:
        pass
nums = list(map(int, input().split()))
if dfs(nums):
    print('true')
else:
    print('false')