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+# 885. Spiral Matrix III
+
+"""
+you start at the cell '(rStart, cStart)' of an 'rows cols' grid facing
+east. the northwest corner is at the first row and column in the grid, and
+the southeast corner is at the last row and column. you will walk in a
+clockwise spiral shape to visit every position in this gid. whenever you move
+outside the grid's boundary, we continue our walk outside the grid (but may
+return to the gid boundary later). eventually we reach all 'rows cols'
+spaces of the grid. return an array of coordinates representing the positions
+of the grid in the order visited.
+"""
+
+
+class Solution(object):
+ def spiralMatrixIII(self, rows, cols, rStart, cStart):
+ """
+ :type rows: int
+ :type cols: int
+ :type rStart: int
+ :type cStart: int
+ :rtype: List[List[int]]
+ """
+ ans = []
+ dx, dy, n = 0, 1, 0
+ while len(ans) < rows * cols:
+ for i in range(n / 2 + 1):
+ if 0 <= x < rows and 0 <= y < cols:
+ ans.append([x, y])
+ x, y = x + dx, y + dy
+ dx, dy, n = dy, -dx, n + 1
+ return ans
+
+
+if __name__ == "__main__":
+ obj = Solution()
+ print(obj.spiralMatrixIII(rows=1, cols=4, rStart=0, cStart=0))
+ print(obj.spiralMatrixIII(rows=5, cols=6, rStart=1, cStart=4))