Merge pull request #2171 from seinlin/211

Add 0211-design-add-and-search-words-data-structure.c

Author: MHamiid

c/0211-design-add-and-search-words-data-structure.c

@@ -0,0 +1,86 @@
+typedef struct WordDictionary{
+    struct WordDictionary *c[26];
+    bool isWord;
+} WordDictionary;
+
+WordDictionary *NewDictionary() {
+    // allocate and init the memory for a dictionary element.
+    WordDictionary *n = (WordDictionary*)calloc(1, sizeof(WordDictionary));
+    return n;
+}
+
+WordDictionary* wordDictionaryCreate() {
+    WordDictionary *root = NewDictionary();
+    return root;
+}
+
+void wordDictionaryAddWord(WordDictionary* obj, char * word) {
+    assert(obj);
+    int n = strlen(word);
+    WordDictionary* dict = obj;
+    int i, j;
+    for (i = 0; i < n; i++) {
+        j = word[i] - 'a';
+        if (!dict->c[j]) {
+            dict->c[j] = NewDictionary();
+        }
+        dict = dict->c[j];
+    }
+    dict->isWord = true;
+}
+
+bool wordDictionarySearchR(WordDictionary* dict, char * word, int index) {
+    assert(dict);
+
+    char c = word[index];
+    int i, j;
+    if (index == strlen(word)) {
+        return dict->isWord;
+    }
+    if (c == '.') {
+        for (i = 0; i < 26; i++) {
+            if (dict->c[i] && wordDictionarySearchR(dict->c[i], word, index + 1)) {
+                return true;
+            }
+        }
+    } else {
+        j = c - 'a';
+        if (!dict->c[j]) {
+            return false;
+        }
+        return wordDictionarySearchR(dict->c[j], word, index + 1);
+    }
+    return false;
+}
+
+bool wordDictionarySearch(WordDictionary* obj, char * word) {
+    assert(obj);
+    return wordDictionarySearchR(obj, word, 0);
+}
+
+void wordDictionaryFreeR(WordDictionary* dict) {
+    assert(dict);
+    int i;
+    for (i = 0; i < 26; i++) {
+        if (dict->c[i]) {
+            return wordDictionaryFreeR(dict->c[i]);
+        }
+    }
+    free(dict);
+}
+
+void wordDictionaryFree(WordDictionary* obj) {
+    assert(obj);
+    wordDictionaryFreeR(obj);
+}
+
+/**
+ * Your WordDictionary struct will be instantiated and called as such:
+ * WordDictionary* obj = wordDictionaryCreate();
+ * wordDictionaryAddWord(obj, word);
+
+ * bool param_2 = wordDictionarySearch(obj, word);
+
+ * wordDictionaryFree(obj);
+*/
+