四位数黑洞问题
num = sys.argv[1]def test(num): num = str(num) x = [] for k in num: if int(k) not in x: x.append(int(k)) for i in range(4-len(x)): x.append(0) x.sort() minNum = x[0]*1000+x[1]*100+x[2]*10+x[3] x.reverse() maxNum = x[0]*1000+x[1]*100+x[2]*10+x[3] if (maxNum-minNum)==6174: print "max:%d-min:%d=%d"%(maxNum,minNum,maxNum-minNum) return else: test(maxNum-minNum) print "max:%d-min:%d=%d"%(maxNum,minNum,maxNum-minNum)test(num)
