Package g2601_2700.s2640_find_the_score_of_all_prefixes_of_an_array

Class Solution

java.lang.Object
g2601_2700.s2640_find_the_score_of_all_prefixes_of_an_array.Solution
public class Solution extends java.lang.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 Summary

    Constructors
    Constructor
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    long[]
    findPrefixScore(int[] nums)
     

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Solution

      public Solution()

  • Method Details

    • findPrefixScore

      public long[] findPrefixScore(int[] nums)