LeetCode Maximum Product of Word Lengths(位操作)

问题：给出一个字符串数组，要求求出两个没有共同字符的字符串的最大积

思路：第一种方法是直接枚举任意两个字符串，看是否有公共字符，如果没有，则计算乘积，并更新最大值。

第二种方法，因为字符范围是a-z，可以计算字符串对应的比特位值，然后看两个比较位构成的数与之后是否0，如果为1，说明没有共同字符。

第三种方法，使用hash表，记录下比特位值之后的对应的最大字符串长度。

具体代码参考：

https://github.com/wuli2496/OJ/tree/master/LeetCode/Maximum%20Product%20of%20Word%20Lengths

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