Update README.md

hshahid · Jul 7, 2016 · 73e1747 · 73e1747
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 [Spiral Matrix](https://leetcode.com/problems/spiral-matrix/)| [Swift](./Array/SpiralMatrix.swift)| Medium| O(n^2)| O(1)|
 [Spiral Matrix II](https://leetcode.com/problems/spiral-matrix/)| [Swift](./Array/SpiralMatrixII.swift)| Medium| O(n^2)| O(1)|
 [Valid Sudoku](https://leetcode.com/problems/valid-sudoku/)| [Swift](./Array/ValidSudoku.swift)| Easy| O(n^2)| O(n)|
+[Sliding Window Maximum ](https://leetcode.com/problems/sliding-window-maximum/)| [Swift](./Array/SlidingWindowMaximum.swift)| Hard| O(n)| O(n)|
 
 ## String
 | Title | Solution | Difficulty | Time | Space |