Given an integer array arr and an integer difference, return the length of the longest subsequence in arr which is an arithmetic sequence such that the difference between adjacent elements in the subsequence equals difference.
A subsequence is a sequence that can be derived from arr by deleting some or no elements without changing the order of the remaining elements.
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Example 1:
\n\n\nInput: arr = [1,2,3,4], difference = 1\nOutput: 4\nExplanation: The longest arithmetic subsequence is [1,2,3,4].\n\n
Example 2:
\n\n\nInput: arr = [1,3,5,7], difference = 1\nOutput: 1\nExplanation: The longest arithmetic subsequence is any single element.\n\n\n
Example 3:
\n\n\nInput: arr = [1,5,7,8,5,3,4,2,1], difference = -2\nOutput: 4\nExplanation: The longest arithmetic subsequence is [7,5,3,1].\n\n\n
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Constraints:
\n\n1 <= arr.length <= 105-104 <= arr[i], difference <= 104Compiled with clang 11 using the latest C++ 20 standard.
Your code is compiled with level two optimization (-O2). AddressSanitizer is also enabled to help detect out-of-bounds and use-after-free bugs.
Most standard library headers are already included automatically for your convenience.
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