Fix broken link for master sliding window reference

apps/website/contents/algorithms/array.md

@@ -82,7 +82,7 @@ Note that because both arrays and strings are sequences (a string is an array of
 
 ### Sliding window
 
-Master the [sliding window technique](https://discuss.leetcode.com/topic/30941/here-is-a-10-line-template-that-can-solve-most-substring-problems) that applies to many subarray/substring problems. In a sliding window, the two pointers usually move in the same direction will never overtake each other. This ensures that each value is only visited at most twice and the time complexity is still O(n). Examples: [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/), [Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/), [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
+Master the [sliding window technique](https://leetcode.com/problems/minimum-window-substring/solutions/26808/here-is-a-10-line-template-that-can-solve-most-substring-problems/) that applies to many subarray/substring problems. In a sliding window, the two pointers usually move in the same direction will never overtake each other. This ensures that each value is only visited at most twice and the time complexity is still O(n). Examples: [Longest Substring Without Repeating Characters](https://leetcode.com/problems/longest-substring-without-repeating-characters/), [Minimum Size Subarray Sum](https://leetcode.com/problems/minimum-size-subarray-sum/), [Minimum Window Substring](https://leetcode.com/problems/minimum-window-substring/)
 
 ### Two pointers