CodingProblems/AutoComplete.java at master · PerrySong/CodingProblems · GitHub

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importjava.util.ArrayList;
importjava.util.HashMap;
importjava.util.List;

publicclassAutoComplete {
classTreeNode {
HashMap<Character, TreeNode> children;
charcha;
booleanisWord;
TreeNode(charcha) {
this.cha = cha;
this.children = newHashMap<>();
this.isWord = isWord;
 }
TreeNode() {
this.children = newHashMap<>();
 }

voidisWord() {
this.isWord = true;
 }
 }

TreeNoderoot;

/**
 * Constructor
 * @param library
 */
publicAutoComplete(String[] library) {
this.root = newTreeNode();

for (Stringword: library) {
TreeNodecur = root;
char[] cArray = word.toCharArray();
for (inti = 0; i < cArray.length; i++) {
if (cur.children.get(cArray[i]) == null)
cur.children.put(cArray[i], newTreeNode(cArray[i]));
cur = cur.children.get(cArray[i]);

 }
cur.isWord();
 }


 }

publicList<String> complete(Stringprefix) {

List<String> res = newArrayList<>();
char[] cArray = prefix.toCharArray();
TreeNodecur = root;
for (charc: cArray) {
if (cur == null) returnres;
cur = cur.children.get(c);
 }

completeHelper(res, newStringBuilder(prefix), cur);

returnres;
 }

//Depth first search helper, add all completed words into list
privatevoidcompleteHelper(List<String> list, StringBuildertmp, TreeNodecur) {
if (cur == null) return;
if (cur.isWord) {
list.add(tmp.toString());
 }

for (TreeNodenode: cur.children.values()) {
tmp.append(node.cha);
completeHelper(list, tmp, node);
tmp.delete(tmp.length() - 1, tmp.length());

 }
 }

publicstaticvoidmain(String[] args) {

String[] sArray = { "bat", "ball", "barrage", "barrier", "bell"};
String[] sArray2 = {
"whids",
"whyever",
"whiff",
"whiffable",
"whiffed",
"Whiffen",
"whiffenpoof",
"whiffer",
"whiffers",
"whiffet",
"whiffets",
"whiffy",
"whiffing",
"whiffle",
"whiffled",
"whiffler",
"whifflery",
"whiffleries",
"whifflers",
"whiffles",
"whiffletree",
"whiffletrees",
"whiffling",
"whifflingly",
"whiffs",
"whyfor",
"whift",
"Whig"
 };

AutoCompletea = newAutoComplete(sArray2);
System.out.println(a.complete("whi"));

System.out.println(a.complete("ba"));
System.out.println(a.complete("be"));
System.out.println(a.complete("a"));
System.out.println(a.complete(""));

//fizz buzz:
// for (int i = 1; i <= 100; i++) {
//
// if (i % 5 == 0 && i % 3 == 0) System.out.println("fizz buzz");
// else if (i % 3 == 0) System.out.println("buzz");
// else if (i % 5 == 0) System.out.println("fizz");
// else System.out.println(i);
// }

 }

}