The key idea is to use a sliding window approach with two frequency maps. Create a frequency map of characters in the pattern string, then slide a window of the same length over the main string and ...

To check whether a string 's2' contains a permutation of another string 's1', we can use a sliding window approach. First, we create a frequency dictionary for characters in 's1'. Then, we initialize ...

Day 6 of my coding challenge: GFG 160 + NeetCode 150 🚀 Problem 1 – Next Permutation (GFG 160) Expected Complexities: Time: O(n) Space: O(1) Brute Force Approach: Generate all permutations recursively ...