Given a matrix of 2-Dimensional array of n rows and n columns. Print this matrix in snake fashion starting from column n-1 as shown in the figure below.
Input : mat = 1 2 3 4 5 6 7 8 9 Output: 3 2 1 4 5 6 9 8 7 Input: mat = 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Output: 4 3 2 1 5 6 7 8 12 11 10 9 13 14 15 16
- Start traversing from top right cell belonging to row 0 and column n-1.
- First move will always be a horizontal move towards LEFT(WEST) direction.
- Alternatively Horizontal and vertical moves are made during matrix traversal.
- In a single horizontal move, we traverse multiple cells till we reach any of the wall of the matrix.
- In a horizontal move, if the row is odd numbered, we move in RIGHT(EAST) direction else we move in LEFT(WEST) direction
- In a single vertical move, we traverse a single cell in DOWNWARDS direction.
Below is the implementation of the above algorithm:
5 4 3 2 1 6 7 8 9 10 15 14 13 12 11 16 17 18 19 20 25 24 23 22 21
Time Complexity: O(N^2)
Space Complexity: O(1)
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Improved By : sriharshanakka