Given a matrix as 2D array. Return the matrix in reverse spiral form.​
Example 1:
Input: R = 3, C = 3
a = {{9, 8, 7},
{6, 5, 4},
{3, 2, 1}}
Output: {5 6 3 2 1 4 7 8 9}
Explanation: Spiral form of the matrix
is 9->8->7->4->1->2->3->6->5 and then
reverse.
Example 2:
Input: R = 4, C = 4 a = {{1, 2, 3, 4},
{5, 6, 7, 8},
{9, 10, 11, 12},
{13, 14, 15, 16}}
Output: {10 11 7 6 5 9 13 14 15 16 12 8 4 3 2 1}
Explanation: Spiral form of the matrix
is 1->2->3->4->8->12->16->15->14->13->9
->5->6->7->11->10 and then reverse.
Your Task:
You dont need to read input or print anything. Complete the function reverseSpiral() which takes R, C and a as input parameters and returns the matrix in reverse spiral form.
Expected Time Complexity: O(R*C) Expected Auxiliary Space: O(R*C)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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