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Author: shatakshigarg

AUTO COMPLETE.txt

@@ -0,0 +1,91 @@
+import java.util.*;
+class TrieNode{
+	char data;
+	boolean isTerminating;
+	TrieNode children[];
+	int childCount;
+
+	public TrieNode(char data) {
+		this.data = data;
+		isTerminating = false;
+		children = new TrieNode[26];
+		childCount = 0;
+	}
+}
+
+public class Trie {
+	private TrieNode root;
+	
+	public Trie() {
+		root = new TrieNode('\0');
+	}
+
+	private void add(TrieNode root, String word){
+		if(word.length() == 0){
+			root.isTerminating = true;
+			return;
+		}		
+		int childIndex = word.charAt(0) - 'a';
+		TrieNode child = root.children[childIndex];
+		if(child == null){
+			child = new TrieNode(word.charAt(0));
+			root.children[childIndex] = child;
+			root.childCount++;
+		}
+		add(child, word.substring(1));
+	}
+
+	public void add(String word){
+		add(root, word);
+	}
+	
+     public TrieNode findword(TrieNode root, String word) { 
+        if(word.length() == 0){
+            return root;
+        }
+        int childIndex = word.charAt(0) - 'a';
+        TrieNode child = root.children[childIndex];
+        if(child == null){
+            return null; 
+        }
+        return findword(child, word.substring(1));
+    } 
+    
+    public void allwords(TrieNode root,String word,String output){  
+        if(root==null)
+            return;
+        if(root.childCount == 0) { 
+            if(output.length() > 0) {
+                System.out.println(word + output); 
+            }
+            return; 
+        }
+        if(root.isTerminating == true) {
+            System.out.println(word + output);
+        }
+
+        for(int i = 0; i < root.children.length; i++) {
+            if(root.children[i] != null) {
+                String ans = output + root.children[i].data; 
+                allwords(root.children[i],word,ans);
+            }
+       }
+    }
+     public void autoComplete(ArrayList<String> input, String word){    
+        // for(String w : input) { 
+        //     add(w); 
+        // }
+          int i=0; 
+        while(i<input.size()){
+            String a=input.get(i);
+            add(root,a); 
+            i++;
+         }  
+        if(root == null || root.childCount == 0) { 
+            return;
+        }
+       TrieNode a=findword(root,word);
+        String output = ""; 
+        allwords(a,word,output); 
+    }
+}