Leetcode Problem 2542. Maximum Subsequence Score

2542. Maximum Subsequence Score

Leetcode Solutions

Key approach of the solution using Priority Queue

  1. Pair up nums1[i] with nums2[i] and store them in an array pairs.
  2. Sort pairs by the second element (nums2[i]) in descending order.
  3. Initialize a min-heap top_k_heap to store the first k elements of nums1 from the sorted pairs.
  4. Initialize top_k_sum to store the sum of elements in top_k_heap.
  5. Initialize answer with the product of top_k_sum and pairs[k - 1][1].
  6. Iterate over the sorted pairs starting from index k:
    • Remove the smallest element from top_k_heap and subtract it from top_k_sum.
    • Add the current nums1[i] to top_k_heap and add it to top_k_sum.
    • Calculate the current score as top_k_sum times nums2[i].
    • Update answer if the current score is greater than the previous maximum.
  7. Return answer as the maximum possible score.
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Key approach of the solution using Sorting and Prefix Sums

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