题解 | #24点游戏算法#

import itertools as it
while 1:
    try:
        a,b,c,d = [int(x) for x in input().split(" ")]
        flag = False
        ls = [a,b,c,d]
        temp = list(it.permutations(ls))
        #print(list(it.permutations(ls)))
        for i in temp:
            a,b,c,d = i[0],i[1],i[2],i[3]
            #print(a,b,c,d)
        
            #print(ls)
            first = []
            second = []
            third = []

            first.append(a+b)
            first.append(a-b)
            first.append(a*b)
            first.append(a/b)

            #print(first)

            for i in first:
                second.append(i+c)
                second.append(i-c)
                second.append(i*c)
                second.append(i/c)

            #print(second)

            for k in second:
                third.append(float(k+d))
                third.append(float(k-d))
                third.append(float(k*d))
                third.append(float(k/d))
            #print(third)

            if float(24) in third:
                flag = True
        if flag == True:
            print("true")
        else:
            print('false')
        
    except:
        break