题解 | #24点游戏算法#

ls=[]
def fun1(l,s):
    if len(l)==0:
        ls.append(s)
        return
    for x in l:
        l1=l[:]
        l1.remove(x)
        if len(s)==0:
            fun1(l1,x)
            fun1(l1,"("+x)
        else:
            fun1(l1[:],s+"+"+x)
            fun1(l1[:],s+"-"+x)
            fun1(l1[:],s+"*"+x)
            fun1(l1[:],s+"/"+x)

            fun1(l1[:],s+"+("+x)
            fun1(l1[:],s+"-("+x)
            fun1(l1[:],s+"*("+x)
            fun1(l1[:],s+"/("+x)
            
            fun1(l1[:],s+"+"+x+")")
            fun1(l1[:],s+"-"+x+")")
            fun1(l1[:],s+"*"+x+")")
            fun1(l1[:],s+"/"+x+")")

l=input().split()
fun1(l,"")
flag="false"
for x in ls:
    try:
        if eval(x)%1==0 and int(eval(x))==24:
            flag="true"
            break
    except:
        continue
print(flag)