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1491. Average Salary Excluding the Minimum and Maximum Salary

Description

You are given an array of unique integers salary where salary[i] is the salary of the ith employee.

Return the average salary of employees excluding the minimum and maximum salary. Answers within 10-5 of the actual answer will be accepted.

 

Example 1:

Input: salary = [4000,3000,1000,2000]
Output: 2500.00000
Explanation: Minimum salary and maximum salary are 1000 and 4000 respectively.
Average salary excluding minimum and maximum salary is (2000+3000) / 2 = 2500

Example 2:

Input: salary = [1000,2000,3000]
Output: 2000.00000
Explanation: Minimum salary and maximum salary are 1000 and 3000 respectively.
Average salary excluding minimum and maximum salary is (2000) / 1 = 2000

 

Constraints:

  • 3 <= salary.length <= 100
  • 1000 <= salary[i] <= 106
  • All the integers of salary are unique.

Solutions

Solution 1: Simulation

Simulate according to the problem's requirements.

Traverse the array, find the maximum and minimum values, and accumulate the sum. Then calculate the average value after removing the maximum and minimum values.

The time complexity is $O(n)$, where $n$ is the length of the array salary. The space complexity is $O(1)$.

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class Solution:
    def average(self, salary: List[int]) -> float:
        s = sum(salary) - min(salary) - max(salary)
        return s / (len(salary) - 2)

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class Solution {
    public double average(int[] salary) {
        int s = 0;
        int mi = 10000000, mx = 0;
        for (int v : salary) {
            mi = Math.min(mi, v);
            mx = Math.max(mx, v);
            s += v;
        }
        s -= (mi + mx);
        return s * 1.0 / (salary.length - 2);
    }
}

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class Solution {
public:
    double average(vector<int>& salary) {
        int s = 0;
        int mi = 1e7, mx = 0;
        for (int v : salary) {
            s += v;
            mi = min(mi, v);
            mx = max(mx, v);
        }
        s -= (mi + mx);
        return (double) s / (salary.size() - 2);
    }
};

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func average(salary []int) float64 {
    s := 0
    mi, mx := 10000000, 0
    for _, v := range salary {
        s += v
        mi = min(mi, v)
        mx = max(mx, v)
    }
    s -= (mi + mx)
    return float64(s) / float64(len(salary)-2)
}

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function average(salary: number[]): number {
    let max = -Infinity;
    let min = Infinity;
    let sum = 0;
    for (const v of salary) {
        sum += v;
        max = Math.max(max, v);
        min = Math.min(min, v);
    }
    return (sum - max - min) / (salary.length - 2);
}

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impl Solution {
    pub fn average(salary: Vec<i32>) -> f64 {
        let n = salary.len() as i32;
        let mut min = i32::MAX;
        let mut max = i32::MIN;
        let mut sum = 0;
        for &num in salary.iter() {
            min = min.min(num);
            max =