题目:如果两个单词的组成字母完全相同，只是字母的排列顺序不一样，则它们就是变位词，两个单词相同也被认为是变位词。如tea 与eat , nic 与cin, ddc与dcd, abc与abc.
核心代码:
<pre><code>`
func isAnagram(first:String,next:String) -> Bool {
if first == next {
return true
}

    var dict:[String:Int] = [:]
    for i in 0..<first.characters.count {
        let char:String = first[i]
        if dict[char] != nil {
            let count:Int = dict[char]!
            dict[char] = count + 1
        } else {
           dict[char] = 1
        }
    }
    
    for i in 0..<next.characters.count {
        let char:String = next[i]
        if dict[char] != nil {
            let count:Int = dict[char]!
            dict[char] = count - 1
        }
    }
    
    var result:Bool = true
    for (_,value) in dict {
        if value != 0 {
            result = false
        }
    }
    return result
}`</code></pre>

测试代码:
<pre><code>`

var isAnagram:Bool = hashSearch.isAnagram(first: "abca", next: "baccccc")
print("FlyElephant-是否是变位词---(isAnagram)")`</code></pre>