Count Prefix and Suffix Pairs I | Brute Force | Trie | Leetcode 3042 | codestorywithMIK
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Hi Everyone, this is the 8th video of our Playlist "Trie : Popular Interview Problems".
Now we will be solving a good practice problem based on Trie and string - Count Prefix and Suffix Pairs I | Brute Force | Trie | Leetcode 3042 | codestorywithMIK
Problem Name : Count Prefix and Suffix Pairs I | Brute Force | Trie | Leetcode 3042 | codestorywithMIK
Company Tags : Will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Trie/Count Prefix and Suffix Pairs I.cpp
Leetcode Link : https://leetcode.com/problems/count-prefix-and-suffix-pairs-i
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Video Summary :
Approach-1: Brute Force
Compares every pair of words to check if one is both a prefix and a suffix of the other.
Extracts substrings for comparison using the substr function.
Straightforward but involves repeated substring operations.
Approach-2: Using Trie
Builds two Tries for each word: one for prefixes and one for reversed suffixes.
Efficiently checks if smaller words are prefixes and suffixes of larger words.
Optimizes lookups using the Trie structure, avoiding redundant comparisons.
✨ Timelines✨
00:00 - Introduction
00:43 - Motivation
02:21 - Problem Explanation
05:19 - Brute Force using find()
11:04 - Brute Force using substr()
14:01 - Using Trie
26:36 - Coding it up
40:12 - Time and Space Complexity
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