#+ANKI_DECK: study_deck_02
* TODO 0076. Minimum Window Substring :hard:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0076. Minimum Window Substring][0076. Minimum Window Substring]]
:END:

Given two strings ~s~ and ~t~ of lengths ~m~ and ~n~ respectively, return /the *minimum window*/ */substring/*/ of /~s~/ such that every character in /~t~/ (*including duplicates*) is included in the window/. If there is no such substring, return /the empty string /~""~.

The testcases will be generated such that the answer is *unique*.

*Example 1:*


#+begin_src
Input: s = "ADOBECODEBANC", t = "ABC"
Output: "BANC"
Explanation: The minimum window substring "BANC" includes 'A', 'B', and 'C' from string t.
#+end_src


*Example 2:*


#+begin_src
Input: s = "a", t = "a"
Output: "a"
Explanation: The entire string s is the minimum window.
#+end_src


*Example 3:*


#+begin_src
Input: s = "a", t = "aa"
Output: ""
Explanation: Both 'a's from t must be included in the window.
Since the largest window of s only has one 'a', return empty string.
#+end_src


*Constraints:*

 - ~m == s.length~

 - ~n == t.length~

 - ~1 <= m, n <= 10^{5}~

 - ~s~ and ~t~ consist of uppercase and lowercase English letters.

*Follow up:* Could you find an algorithm that runs in ~O(m + n)~ time?

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python :lc-problem 76 :lc-lang python3
class Solution:
    def minWindow(self, s: str, t: str) -> str:
#+end_src

** TODO C++
#+begin_src cpp :lc-problem 76
class Solution {
public:
    string minWindow(string s, string t) {
        
    }
};
#+end_src