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Rotate a matrix by 90 degree without using any extra space(Anticlockwise)

Rotate a matrix by 90 degree without using any extra space(Anticlockwise)

(Asked by MICROSOFT, PAYTM, SAMSUNG, AMAZON, SNAPDEAL…)

Wave Array in Java

WAVE ARRAY IN JAVA
Given an unsorted array of integers, sort the array into a wave like array. An array ‘arr[0..n-1]’ is sorted in wave form if arr[0] >= arr[1] = arr[3] = …..