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Trie_Implementation.java
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Trie_Implementation.java
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public class Trie {
static final int ALPHABET_SIZE = 26;
// trie node
static class TrieNode
{
TrieNode[] children = new TrieNode[ALPHABET_SIZE];
boolean isEndOfWord;
TrieNode(){
isEndOfWord = false;
for (int i = 0; i < ALPHABET_SIZE; i++)
children[i] = null;
}
};
static TrieNode root;
static void insert(String key)
{
int level;
int length = key.length();
int index;
TrieNode pCrawl = root;
for (level = 0; level < length; level++)
{
index = key.charAt(level) - 'a';
if (pCrawl.children[index] == null)
pCrawl.children[index] = new TrieNode();
pCrawl = pCrawl.children[index];
}
pCrawl.isEndOfWord = true;
}
static boolean search(String key)
{
int level;
int length = key.length();
int index;
TrieNode pCrawl = root;
for (level = 0; level < length; level++)
{
index = key.charAt(level) - 'a';
if (pCrawl.children[index] == null)
return false;
pCrawl = pCrawl.children[index];
}
return (pCrawl.isEndOfWord);
}
public static void main(String args[])
{
String keys[] = {"the", "a", "there", "answer", "any",
"by", "bye", "their"};
String output[] = {"Not present in trie", "Present in trie"};
root = new TrieNode();
int i;
for (i = 0; i < keys.length ; i++)
insert(keys[i]);
if(search("the") == true)
System.out.println("the --- " + output[1]);
else System.out.println("the --- " + output[0]);
if(search("these") == true)
System.out.println("these --- " + output[1]);
else System.out.println("these --- " + output[0]);
if(search("their") == true)
System.out.println("their --- " + output[1]);
else System.out.println("their --- " + output[0]);
if(search("thaw") == true)
System.out.println("thaw --- " + output[1]);
else System.out.println("thaw --- " + output[0]);
}
}