feat(work): add Rotate Image and Spiral Matrix solutions

work/1/Medium/Array/48.rotate-image.py

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+"""
+48. Rotate Image
+Difficulty: Medium
+https://leetcode.com/problems/rotate-image/
+
+──────────────────────────────────────────────────
+
+You are given an n x n 2D matrix representing an image, rotate the
+image by 90 degrees (clockwise).
+
+You have to rotate the image in-place, which means you have to modify
+the input 2D matrix directly. DO NOT allocate another 2D matrix and do
+the rotation.
+
+
+
+Example 1:
+
+Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
+Output: [[7,4,1],[8,5,2],[9,6,3]]
+
+Example 2:
+
+Input: matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]
+Output: [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]
+
+
+
+Constraints:
+
+        • n == matrix.length == matrix[i].length
+
+        • 1 <= n <= 20
+
+        • -1000 <= matrix[i][j] <= 1000
+"""
+
+
+class Solution:
+    def rotate(self, matrix: List[List[int]]) -> None:
+        n = len(matrix)
+        for r in range(n):
+            for c in range(r + 1, n):
+                matrix[r][c], matrix[c][r] = matrix[c][r], matrix[r][c]
+
+        for r in range(n):
+            matrix[r].reverse()

work/1/Medium/Array/54.spiral-matrix.py

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+"""
+54. Spiral Matrix
+Difficulty: Medium
+https://leetcode.com/problems/spiral-matrix/
+
+──────────────────────────────────────────────────
+
+Given an m x n matrix, return all elements of the matrix in spiral
+order.
+
+
+
+Example 1:
+
+Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]
+Output: [1,2,3,6,9,8,7,4,5]
+
+Example 2:
+
+Input: matrix = [[1,2,3,4],[5,6,7,8],[9,10,11,12]]
+Output: [1,2,3,4,8,12,11,10,9,5,6,7]
+
+
+
+Constraints:
+
+        • m == matrix.length
+
+        • n == matrix[i].length
+
+        • 1 <= m, n <= 10
+
+        • -100 <= matrix[i][j] <= 100
+"""
+
+
+class Solution:
+    def spiralOrder(self, matrix: List[List[int]]) -> List[int]:
+        res = []
+        top, bottom = 0, len(matrix) - 1
+        left, right = 0, len(matrix[0]) - 1
+
+        while top <= bottom and left <= right:
+            # 1. Top Row
+            for c in range(left, right + 1):
+                res.append(matrix[top][c])
+            top += 1
+
+            # 2. Right Column
+            for r in range(top, bottom + 1):
+                res.append(matrix[r][right])
+            right -= 1
+
+            # 3. Bottom Row
+            if top <= bottom:
+                for c in range(right, left - 1, -1):
+                    res.append(matrix[bottom][c])
+                bottom -= 1
+
+            # 4. Left Column
+            if left <= right:
+                for r in range(bottom, top - 1, -1):
+                    res.append(matrix[r][left])
+                left += 1
+
+        return res