The imbalance number of a 0-indexed integer array arr of length n is defined as the number of indices in sarr = sorted(arr) such that:
0 <= i < n - 1, andsarr[i+1] - sarr[i] > 1Here, sorted(arr) is the function that returns the sorted version of arr.
Given a 0-indexed integer array nums, return the sum of imbalance numbers of all its subarrays.
A subarray is a contiguous non-empty sequence of elements within an array.
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Example 1:
\n\n\nInput: nums = [2,3,1,4]\nOutput: 3\nExplanation: There are 3 subarrays with non-zero imbalance numbers:\n- Subarray [3, 1] with an imbalance number of 1.\n- Subarray [3, 1, 4] with an imbalance number of 1.\n- Subarray [1, 4] with an imbalance number of 1.\nThe imbalance number of all other subarrays is 0. Hence, the sum of imbalance numbers of all the subarrays of nums is 3. \n\n\n
Example 2:
\n\n\nInput: nums = [1,3,3,3,5]\nOutput: 8\nExplanation: There are 7 subarrays with non-zero imbalance numbers:\n- Subarray [1, 3] with an imbalance number of 1.\n- Subarray [1, 3, 3] with an imbalance number of 1.\n- Subarray [1, 3, 3, 3] with an imbalance number of 1.\n- Subarray [1, 3, 3, 3, 5] with an imbalance number of 2. \n- Subarray [3, 3, 3, 5] with an imbalance number of 1. \n- Subarray [3, 3, 5] with an imbalance number of 1.\n- Subarray [3, 5] with an imbalance number of 1.\nThe imbalance number of all other subarrays is 0. Hence, the sum of imbalance numbers of all the subarrays of nums is 8.\n\n
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Constraints:
\n\n1 <= nums.length <= 10001 <= nums[i] <= nums.lengthCompiled 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.
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