Please help me in solving this problem. There is no editorial available for this problem.
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Someone please help.
It is solved with segment tree. You go through the array and keep the segment tree where for every number you store the length of the longest such sequence that ends on such number. When you handle new array element, you just have to take maximum on [a[i] — k, a[i] + k] plus one and update the value for a[i] in the segment tree.
can it be done without using segment tree
Not as far as I know.
Thank you for helping.