type WordDictionary struct {
subChar []*WordDictionary
end bool
}
func Constructor() WordDictionary {
return WordDictionary{
subChar: make([]*WordDictionary, 26),
}
}
func search(node *WordDictionary, word string) *WordDictionary {
if len(word) == 0 {
if node.end {
return node
}
return nil
}
char := word[0]
if char == '.' {
for _, item := range node.subChar {
if item != nil {
res := search(item, word[1:])
if res != nil && res.end {
return res
}
}
}
return nil
} else {
char = char - 'a'
if node.subChar[char] == nil {
return nil
}
return search(node.subChar[char], word[1:])
}
}
func (this *WordDictionary) AddWord(word string) {
node := this
for _, char := range word {
idx := char - 'a'
if node.subChar[idx] == nil {
sub := Constructor()
node.subChar[idx] = &sub
}
node = node.subChar[idx]
}
node.end = true
}
func (this *WordDictionary) Search(word string) bool {
node := search(this, word)
if node == nil || !node.end {
return false
}
return true
}
