Word Search II | Day 30 | Trie Data Structure [ June LeetCoding Challenge ] [ Leetcode #212] [ 2020]

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The day 30 problem in June Leetcoding Challenge. ( Word Search II ).

Problem statement:
Given a 2D board and a list of words from the dictionary, find all words in the board.

Each word must be constructed from letters of sequentially adjacent cell, where "adjacent" cells are those horizontally or vertically neighboring. The same letter cell may not be used more than once in a word.

Example:
Input:
board = [
['o','a','a','n'],
['e','t','a','e'],
['i','h','k','r'],
['i','f','l','v']
]
words = ["oath","pea","eat","rain"]

Output: ["eat","oath"]

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