new_contents: class Solution:
      # @param {integer} n
      # @return {integer[][]}
      def generateMatrix(self, n):
          if n < 1:
              return []
          res = [[0 for _ in range(n)] for _ in range(n)]
          top, bottom = 0, n - 1
          left, right = 0, n - 1
          num = 1
          while left < right and top < bottom:
              for j in range(left, right + 1):
                  res[top][j] = num
                  num += 1
              for i in range(top + 1, bottom):
                  res[i][right] = num
                  num += 1
              for j in range(right, left - 1, -1):
                  res[bottom][j] = num
                  num += 1
              for i in range(bottom - 1, top, -1):
                  res[i][left] = num
                  num += 1
              left += 1
              right -= 1
              top += 1
              bottom -= 1
          if top == bottom:
              for j in range(left, right + 1):
                  res[top][j] = num
          elif left == right:
              for i in range(top, bottom + 1):
                  res[i][left] = num
          
          return res
  
subject: Create SpiralMatrixII_001.py