题解 | #寻找第K大#

import sys

inlist=[list(map(int,len.strip().split(" "))) for len in sys.stdin]
def getpossibleaction(a,b):
    possibleaction=[]
    possibleaction.append(a+b)
    possibleaction.append(a*b)
    possibleaction.append(a/b)
    possibleaction.append(a-b)
    return possibleaction
    
def getpossible24(s):
    for a in range(4):
        first=copy.copy(s)
        x1=first.pop(a)
        for b in range(3):
            second=copy.copy(first)
            x2=second.pop(b)
            possibles=getpossibleaction(x1, x2)
            for r1 in possibles:
                for c in range(2):
                    third=copy.copy(second)
                    x3=third.pop(c)
                    possibles2=getpossibleaction(r1, x3)
                    for r2 in possibles2:
                        for d in range(1):
                            fourth=copy.copy(third)
                            x4=fourth.pop(d)
                            possibles3=getpossibleaction(r2, x4)
                            if 24 in possibles3:
                                print('true')
                                return
    print('false')
    return
for s in inlist:
    getpossible24(s)