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Problem · Array

Project Estimates

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Problem statement

A number of bids are being taken for a project. Determine the number of distinct pairs of project costs where their absolute difference is some target value. Two pairs are distinct if they differ in at least one value.

Function

countPairs(n: int, projectCosts: int[], target: int) → int

Complete the function countPairs in the editor.

countPairs has the following parameter(s):

  • int projectCosts[n]: array of integers
  • int target: the target difference

    • Returns

  • int: the number of distinct pairs in projectCosts with an absolute difference of target

    • Examples

    Example 1

    n = 5projectCosts = [1, 5, 3, 4, 2]target = 2return = 3
    Count the number of pairs in projectCosts whose difference is target = 2. The following three pairs meet the criterion: (1, 3), (5, 3), and (4, 2).

    Example 2

    n = 3projectCosts = [1, 3, 5]target = 2return = 2
    There are 2 pairs [1, 3], [3, 5] that have the target difference target = 2, therefore a value of 2 is returned.

    Constraints

  • 5 < n <= 2 * 105
  • 0 < projectCosts[i] <= 2 * 109
  • Each projectCosts[i] is distinct, i.e. unique within projectCosts
  • 1 <= target<= 109

    • More Goldman Sachs problems

    drafts saved locally
    public int countPairs(int n, int[] projectCosts, int target) {
    // write your code here
}
    n5
    projectCosts[1, 5, 3, 4, 2]
    target2
    expected3
    checking account