関連ワード:  maximum subarray with k elements    maximum subarray with k distinct elements    maximum subarray sum with k elements    maximum sum of a subarray with k elements leetcode    maximum subarray sum with k distinct elements    maximum subarray sum with exactly k elements    maximum subarray sum with at most k elements    maximum sum subarray with at least k elements    maximum subarray sum with at most k distinct elements    example problem maximum sum of a subarray with k elements