快算24

一副牌，除了大小王之外还有52张，从1到13每个数目各有四张。要求设计一个程序，对于任意给出52张牌中的四张，运用＋－×÷四种运算来判断能否每个数只能用一次，但不能不用，算出24来。-A quick count of 24 licenses, in addition to the size of Wang addition to 52, from 1-13 for each number of each 4. Asked to design a procedure, for any given 52 licenses of four, the use of　- × ÷ four computing to determine whether each number can only be used once, but you can not do not have to calculate 24 years.