You are given a 0-indexed integer array arr and an integer k. The array arr is circular. In other words, the first element of the array is the next element of the last element, and the last element of the array is the previous element of the first element.
You can do the following operation any number of times:
\n\narr and increase or decrease it by 1.Return the minimum number of operations such that the sum of each subarray of length k is equal.
A subarray is a contiguous part of the array.
\n\n\n
Example 1:
\n\n\nInput: arr = [1,4,1,3], k = 2\nOutput: 1\nExplanation: we can do one operation on index 1 to make its value equal to 3.\nThe array after the operation is [1,3,1,3]\n- Subarray starts at index 0 is [1, 3], and its sum is 4 \n- Subarray starts at index 1 is [3, 1], and its sum is 4 \n- Subarray starts at index 2 is [1, 3], and its sum is 4 \n- Subarray starts at index 3 is [3, 1], and its sum is 4 \n\n\n
Example 2:
\n\n\nInput: arr = [2,5,5,7], k = 3\nOutput: 5\nExplanation: we can do three operations on index 0 to make its value equal to 5 and two operations on index 3 to make its value equal to 5.\nThe array after the operations is [5,5,5,5]\n- Subarray starts at index 0 is [5, 5, 5], and its sum is 15\n- Subarray starts at index 1 is [5, 5, 5], and its sum is 15\n- Subarray starts at index 2 is [5, 5, 5], and its sum is 15\n- Subarray starts at index 3 is [5, 5, 5], and its sum is 15 \n\n\n
\n
Constraints:
\n\n1 <= k <= arr.length <= 1051 <= arr[i] <= 109Compiled 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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