76. Minimum Window Substring

Given two strings s and t, return the minimum window in s which will contain all the characters in t. If there is no such window in s that covers all characters in t, return the empty string ''. Note: If there are multiple answers, return the shortest one. Example 1: Input: s = 'ADOBECODEBANC', t = 'ABC' Output: 'BANC' Example 2: Input: s = 'a', t = 'a' Output: 'a' Constraints: - 1 <= s.length, t.length <= 105 - s and t consist of English letters.

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