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Added new File WordBoggle.java in Java/Misc (#2007)
* Added New Java file in Java/Misc * Update largestRange.java * Update largestRange.java * Update largestRange.java * Update largestRange.java * Revert "Largest range" * Added WordBoggle.java * Update WordBoggle.java * Added RangeInSortedArray.java in Java/Misc
This commit is contained in:
Azad Nautiyal
82
Misc/RangeInSortedArray.java
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82
Misc/RangeInSortedArray.java
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package Misc;
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import java.util.*;
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public class RangeInSortedArray {
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public static void main(String[] args) {
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// Testcases
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assert Arrays.equals(sortedRange(new int[] {1, 2, 3, 3, 3, 4, 5}, 3), new int[] {2, 4});
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assert Arrays.equals(sortedRange(new int[] {1, 2, 3, 3, 3, 4, 5}, 4), new int[] {5, 5});
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assert Arrays.equals(sortedRange(new int[] {0, 1, 2}, 3), new int[] {-1, -1});
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}
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// Get the 1st and last occurrence index of a number 'key' in a non-decreasing array 'nums'
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// Gives [-1, -1] in case element doesn't exist in array
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public static int[] sortedRange(int[] nums, int key) {
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int[] range = new int[] {-1, -1};
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alteredBinSearchIter(nums, key, 0, nums.length - 1, range, true);
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alteredBinSearchIter(nums, key, 0, nums.length - 1, range, false);
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return range;
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}
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// Recursive altered binary search which searches for leftmost as well as rightmost occurrence of
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// 'key'
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public static void alteredBinSearch(
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int[] nums, int key, int left, int right, int[] range, boolean goLeft) {
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if (left > right) return;
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int mid = (left + right) / 2;
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if (nums[mid] > key) alteredBinSearch(nums, key, left, mid - 1, range, goLeft);
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else if (nums[mid] < key) alteredBinSearch(nums, key, mid + 1, right, range, goLeft);
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else {
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if (goLeft) {
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if (mid == 0 || nums[mid - 1] != key) range[0] = mid;
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else alteredBinSearch(nums, key, left, mid - 1, range, goLeft);
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} else {
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if (mid == nums.length - 1 || nums[mid + 1] != key) range[1] = mid;
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else alteredBinSearch(nums, key, mid + 1, right, range, goLeft);
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}
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}
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}
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// Iterative altered binary search which searches for leftmost as well as rightmost occurrence of
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// 'key'
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public static void alteredBinSearchIter(
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int[] nums, int key, int left, int right, int[] range, boolean goLeft) {
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while (left <= right) {
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int mid = (left + right) / 2;
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if (nums[mid] > key) right = mid - 1;
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else if (nums[mid] < key) left = mid + 1;
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else {
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if (goLeft) {
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if (mid == 0 || nums[mid - 1] != key) {
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range[0] = mid;
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return;
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} else right = mid - 1;
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} else {
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if (mid == nums.length - 1 || nums[mid + 1] != key) {
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range[1] = mid;
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return;
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} else left = mid + 1;
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}
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}
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}
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}
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public static int getCountLessThan(int[] nums, int key) {
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return getLessThan(nums, key, 0, nums.length - 1);
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}
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public static int getLessThan(int[] nums, int key, int left, int right) {
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int count = 0;
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while (left <= right) {
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int mid = (left + right) / 2;
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if (nums[mid] > key) right = mid - 1;
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else if (nums[mid] <= key) {
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count = mid + 1; // Atleast mid+1 elements exist which are <= key
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left = mid + 1;
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}
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}
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return count;
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}
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}
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130
Misc/WordBoggle.java
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130
Misc/WordBoggle.java
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import java.util.*;
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public class WordBoggle {
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/**
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* O(nm * 8^s + ws) time where n=width of boggle board, m=height of boggle board, s=length of
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* longest word in string array, w= length of string array, 8 is due to 8 explorable neighbours
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* O(nm + ws) space.
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*/
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public static List<String> boggleBoard(char[][] board, String[] words) {
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Trie trie = new Trie();
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for (String word : words) trie.add(word);
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Set<String> finalWords = new HashSet<>();
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boolean[][] visited = new boolean[board.length][board.length];
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for (int i = 0; i < board.length; i++)
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for (int j = 0; j < board[i].length; j++)
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explore(i, j, board, trie.root, visited, finalWords);
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return new ArrayList<>(finalWords);
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}
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public static void main(String[] args) {
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// Testcase
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List<String> ans =
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new ArrayList<>(
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Arrays.asList("a", "boggle", "this", "NOTRE_PEATED", "is", "simple", "board"));
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assert (boggleBoard(
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new char[][] {
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{'t', 'h', 'i', 's', 'i', 's', 'a'},
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{'s', 'i', 'm', 'p', 'l', 'e', 'x'},
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{'b', 'x', 'x', 'x', 'x', 'e', 'b'},
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{'x', 'o', 'g', 'g', 'l', 'x', 'o'},
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{'x', 'x', 'x', 'D', 'T', 'r', 'a'},
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{'R', 'E', 'P', 'E', 'A', 'd', 'x'},
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{'x', 'x', 'x', 'x', 'x', 'x', 'x'},
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{'N', 'O', 'T', 'R', 'E', '_', 'P'},
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{'x', 'x', 'D', 'E', 'T', 'A', 'E'},
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},
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new String[] {
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"this",
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"is",
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"not",
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"a",
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"simple",
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"test",
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"boggle",
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"board",
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"REPEATED",
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"NOTRE_PEATED",
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})
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.equals(ans));
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}
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public static void explore(
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int i,
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int j,
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char[][] board,
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TrieNode trieNode,
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boolean[][] visited,
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Set<String> finalWords) {
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if (visited[i][j]) return;
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char letter = board[i][j];
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if (!trieNode.children.containsKey(letter)) {
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return;
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}
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visited[i][j] = true;
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trieNode = trieNode.children.get(letter);
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if (trieNode.children.containsKey('*')) finalWords.add(trieNode.word);
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List<Integer[]> neighbors = getNeighbors(i, j, board);
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for (Integer[] neighbor : neighbors)
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explore(neighbor[0], neighbor[1], board, trieNode, visited, finalWords);
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visited[i][j] = false;
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}
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public static List<Integer[]> getNeighbors(int i, int j, char[][] board) {
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List<Integer[]> neighbors = new ArrayList<>();
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if (i > 0 && j > 0) neighbors.add(new Integer[] {i - 1, j - 1});
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if (i > 0 && j < board[0].length - 1) neighbors.add(new Integer[] {i - 1, j + 1});
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if (i < board.length - 1 && j < board[0].length - 1)
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neighbors.add(new Integer[] {i + 1, j + 1});
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if (i < board.length - 1 && j > 0) neighbors.add(new Integer[] {i + 1, j - 1});
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if (i > 0) neighbors.add(new Integer[] {i - 1, j});
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if (i < board.length - 1) neighbors.add(new Integer[] {i + 1, j});
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if (j > 0) neighbors.add(new Integer[] {i, j - 1});
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if (j < board[0].length - 1) neighbors.add(new Integer[] {i, j + 1});
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return neighbors;
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}
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}
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// Trie used to optimize string search
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class TrieNode {
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Map<Character, TrieNode> children = new HashMap<>();
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String word = "";
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}
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class Trie {
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TrieNode root;
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char endSymbol;
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public Trie() {
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this.root = new TrieNode();
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this.endSymbol = '*';
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}
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public void add(String str) {
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TrieNode node = this.root;
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for (int i = 0; i < str.length(); i++) {
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char letter = str.charAt(i);
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if (!node.children.containsKey(letter)) {
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TrieNode newNode = new TrieNode();
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node.children.put(letter, newNode);
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}
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node = node.children.get(letter);
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}
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node.children.put(this.endSymbol, null);
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node.word = str;
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}
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}
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