Package g2601_2700.s2640_find_the_score_of_all_prefixes_of_an_array

Class Solution

  • public class Solution
extends Object
    2640 - Find the Score of All Prefixes of an Array.

    Medium

    We define the conversion array conver of an array arr as follows:

    • conver[i] = arr[i] + max(arr[0..i]) where max(arr[0..i]) is the maximum value of arr[j] over 0 <= j <= i.

    We also define the score of an array arr as the sum of the values of the conversion array of arr.

    Given a 0-indexed integer array nums of length n, return an array ans of length n where ans[i] is the score of the prefix nums[0..i].

    Example 1:

    Input: nums = [2,3,7,5,10]

    Output: [4,10,24,36,56]

    Explanation:

    For the prefix [2], the conversion array is [4] hence the score is 4

    For the prefix [2, 3], the conversion array is [4, 6] hence the score is 10

    For the prefix [2, 3, 7], the conversion array is [4, 6, 14] hence the score is 24

    For the prefix [2, 3, 7, 5], the conversion array is [4, 6, 14, 12] hence the score is 36

    For the prefix [2, 3, 7, 5, 10], the conversion array is [4, 6, 14, 12, 20] hence the score is 56

    Example 2:

    Input: nums = [1,1,2,4,8,16]

    Output: [2,4,8,16,32,64]

    Explanation:

    For the prefix [1], the conversion array is [2] hence the score is 2

    For the prefix [1, 1], the conversion array is [2, 2] hence the score is 4

    For the prefix [1, 1, 2], the conversion array is [2, 2, 4] hence the score is 8

    For the prefix [1, 1, 2, 4], the conversion array is [2, 2, 4, 8] hence the score is 16

    For the prefix [1, 1, 2, 4, 8], the conversion array is [2, 2, 4, 8, 16] hence the score is 32

    For the prefix [1, 1, 2, 4, 8, 16], the conversion array is [2, 2, 4, 8, 16, 32] hence the score is 64

    Constraints:

    • 1 <= nums.length <= 105
    • 1 <= nums[i] <= 109

    • Constructor Detail

      • Solution

        public Solution()

    • Method Detail

      • findPrefixScore

        public long[] findPrefixScore​(int[] nums)