mediumTwo PointersPattern: Two Pointer Pattern
Minimum Window Substring with Two Pointers Solution
Problem Statement
Given two strings s and t, write a function to find the minimum window in s that contains all characters of t. If no such window exists, return an empty string.
Examples
Example 1:
Input:s = 'ADOBECODEBANC', t = 'ABC'
Output:BANC
Explanation: The minimum window in s that contains all characters of t is 'BANC'.
Example 2:
Input:s = 'a', t = 'aa'
Output:
Explanation: No such window exists in s that contains all characters of t.
Constraints
- 1 <= s.length <= 10^5
- 1 <= t.length <= 10^4
- s and t consist of lowercase English letters only
Time: O(n) Space: O(1)
The optimized approach uses the two-pointer technique and a hashmap to count the frequency of characters, resulting in a time complexity of O(n).
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