notes/OJ notes/pages/Leetcode Average-Salary-Excluding-the-Minimum-and-Maximum-Salary.md

Leetcode Average-Salary-Excluding-the-Minimum-and-Maximum-Salary

2022-07-23 15:27

Difficulty:

#coding_problem #difficulty-easy

Additional tags:

#leetcode #math

Revisions:

N/A

Related topics:

Links:

• Link to problem

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Problem

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.

Examples

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.

Thoughts

[!summary] This is a #math problem

The one solution I came up with is using math.

When counting total, be warned of integer overflows.

Solution

class Solution {
public:
  double average(vector<int> &salary) {
    double ans = 0, factor = salary.size() - 2;
    int maxSal = 0, minSal = 1000001;

    for (int i = 0, size = factor + 2; i < size; i++) {
      ans += salary[i] / factor;
      maxSal = max(maxSal, salary[i]);
      minSal = min(minSal, salary[i]);
    }
    return ans - minSal / factor - maxSal / factor;
  }
};