题解 | #24点游戏算法#

def f(nums,target):
    if (len(nums) == 1):
       return nums[0] == target
    for i in range(len(nums)):
        c = nums[i]  # 当前数字
        tmp = nums[:i] + nums[i+1:]  # 列表中的其他数字
        if f(tmp,target+c) or f(tmp,target-c) or f(tmp,target*c) or f(tmp,target/c):
            return True
    return False


while True:
    try:
        nums = list(map(int,input().split()))
        if f(nums,24):
            print('true')
        else:
            print('false')

    except:
        break