摘要：
Strobogrammatic Number II give us all the strings with length n, then we can call it to get strings with length between low.length() and high.length() 阅读全文
摘要：
参考http://segmentfault.com/a/1190000003787462 找出所有的可能，必然是深度优先搜索。但是每轮搜索如何建立临时的字符串呢？因为数是“对称”的，我们插入一个字母就知道对应位置的另一个字母是什么，所以我们可以从中间插入来建立这个临时的字符串。这样每次从中间插入两个 阅读全文
摘要：
A strobogrammatic number is a number that looks the same when rotated 180 degrees (looked at upside down). Write a function to determine if a number is strobogrammatic. The number is represented as ... 阅读全文