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Given 2 strings, a and b, return a string of the form: shorter+reverse(longer)+shorter.
In other words, the shortest string has to be put as prefix and as suffix of the reverse of the longest.
Strings a and b may be empty, but not null (In C# strings may also be null. Treat them as if they are empty.).
If a and b have the same length treat a as the longer producing b+reverse(a)+b
我的解法，让人不满意的是if和else的判断太多了。
空字符串和非空字符串，本身是可以直接拼接的
using System; using System.Linq; class ReverseLonger { public static string ShorterReverseLonger(string a, string b) { a = a ?? string.Empty; b = b ?? string.Empty; string str = string.Empty; if (a.Equals(string.Empty)) { if (b.Equals(string.Empty)) { } else { str = string.Join(string.Empty, b.Reverse()); } } else { if (b.Equals(string.Empty)) { str = string.Join(string.Empty, a.Reverse()); } else { if (a.Length < b.Length) { str = a + string.Join(string.Empty, b.Reverse()) + a; } else { str = b + string.Join(string.Empty, a.Reverse()) + b; } } } return str; } }
其他人的解法：
比我好的地方是，通过比较大小，之后用统一的格式来处理
using System.Linq; class ReverseLonger { public static string ShorterReverseLonger(string a, string b) { if(a == null) a = string.Empty; if(b == null) b = string.Empty; if(a.Length < b.Length) { string d = a; a = b; b = d; } return b + (new string(a.Reverse().ToArray())) + b; } }
shorter concat [reverse longer]
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原文地址：http://www.cnblogs.com/chucklu/p/4622047.html
