LeetCode in Kotlin

2358. Maximum Number of Groups Entering a Competition

Medium

You are given a positive integer array grades which represents the grades of students in a university. You would like to enter all these students into a competition in ordered non-empty groups, such that the ordering meets the following conditions:

• The sum of the grades of students in the ith group is less than the sum of the grades of students in the (i + 1)th group, for all groups (except the last).
• The total number of students in the ith group is less than the total number of students in the (i + 1)th group, for all groups (except the last).

Return the maximum number of groups that can be formed.

Example 1:

Input: grades = [10,6,12,7,3,5]

Output: 3

Explanation: The following is a possible way to form 3 groups of students:

• 1^st group has the students with grades = [12]. Sum of grades: 12. Student count: 1

• 2^nd group has the students with grades = [6,7]. Sum of grades: 6 + 7 = 13. Student count: 2

• 3^rd group has the students with grades = [10,3,5]. Sum of grades: 10 + 3 + 5 = 18. Student count: 3

It can be shown that it is not possible to form more than 3 groups.

Example 2:

Input: grades = [8,8]

Output: 1

Explanation: We can only form 1 group, since forming 2 groups would lead to an equal number of students in both groups.

Constraints:

• 1 <= grades.length <= 105
• 1 <= grades[i] <= 105

Solution

class Solution {
    fun maximumGroups(grades: IntArray): Int {
        val len = grades.size
        return (-1 + Math.sqrt(1.0 + 8 * len)).toInt() / 2
    }
}

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