1 files changed, 116 insertions, 0 deletions
diff --git a/prefix/main.go b/prefix/main.go
new file mode 100644
index 0000000..cbf472d
--- /dev/null
+++ b/prefix/main.go
@@ -0,0 +1,116 @@
+package main
+
+import "fmt"
+
+/**
+Design a data structure that supports adding new words and finding if a string matches any previously added string.
+
+Implement the WordDictionary class:
+
+    WordDictionary() Initializes the object.
+    void addWord(word) Adds word to the data structure, it can be matched later.
+    bool search(word) Returns true if there is any string in the data structure that matches word or false otherwise. word may contain dots '.' where dots can be matched with any letter.
+
+
+
+Example:
+
+Input
+["WordDictionary","addWord","addWord","addWord","search","search","search","search"]
+[[],["bad"],["dad"],["mad"],["pad"],["bad"],[".ad"],["b.."]]
+Output
+[null,null,null,null,false,true,true,true]
+
+Explanation
+WordDictionary wordDictionary = new WordDictionary();
+wordDictionary.addWord("bad");
+wordDictionary.addWord("dad");
+wordDictionary.addWord("mad");
+wordDictionary.search("pad"); // return False
+wordDictionary.search("bad"); // return True
+wordDictionary.search(".ad"); // return True
+wordDictionary.search("b.."); // return True
+
+
+
+Constraints:
+
+    1 <= word.length <= 25
+    word in addWord consists of lowercase English letters.
+    word in search consist of '.' or lowercase English letters.
+    There will be at most 2 dots in word for search queries.
+    At most 104 calls will be made to addWord and search.
+**/
+
+type WordDictionary struct {
+	is_terminal bool
+	children    [26]*WordDictionary
+}
+
+func Constructor() WordDictionary {
+	return WordDictionary{
+		is_terminal: false,
+		children:    [26]*WordDictionary{},
+	}
+}
+
+func (this *WordDictionary) AddWord(word string) {
+	cur := this
+	for _, char := range word {
+		fmt.Println(char)
+		ascii := char - 97
+
+		if cur.children[ascii] == nil {
+			tmp := Constructor()
+			cur.children[ascii] = &tmp
+		}
+
+		cur = cur.children[ascii]
+	}
+	cur.is_terminal = true
+}
+
+func (this *WordDictionary) Search(word string) bool {
+	cur := this
+	for idx, char := range word {
+		if char == '.' {
+			for _, child := range cur.children {
+				if child != nil {
+					fmt.Printf("RECURSIVE SEARCHING %s for entry word %s\n", word[idx+1:], word)
+					if child.Search(word[idx+1:]) {
+						return true
+					}
+				}
+			}
+			return false
+		}
+
+		ascii := char - 97
+		next := cur.children[ascii]
+		if next == nil {
+			return false
+		}
+
+		cur = next
+	}
+
+	return cur.is_terminal
+}
+
+/**
+ * Your WordDictionary object will be instantiated and called as such:
+ * obj := Constructor();
+ * obj.AddWord(word);
+ * param_2 := obj.Search(word);
+ */
+
+func main() {
+	wordDictionary := Constructor()
+	wordDictionary.AddWord("bad")
+	wordDictionary.AddWord("dad")
+	wordDictionary.AddWord("mad")
+	fmt.Println(wordDictionary.Search("pad")) // return False
+	fmt.Println(wordDictionary.Search("bad")) // return True
+	fmt.Println(wordDictionary.Search(".ad")) // return True
+	fmt.Println(wordDictionary.Search("b..")) // return True
+}