題目:如果兩個單詞的組成字母完全相同，只是字母的排列順序不一樣，則它們就是變位詞，兩個單詞相同也被認(rèn)為是變位詞。如tea 與eat , nic 與cin, ddc與dcd, abc與abc.
核心代碼:
<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>

測試代碼:
<pre><code>`

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