题解 | #平均年龄#

#include <iostream>
#include <cmath>
using namespace std;

// 计算一年后的平均年龄
float calculateNextYear(float currentAge, double leaveRate) {
    // 留任员工年龄增长1岁
    float stayEmployees = (1 - leaveRate) * (currentAge + 1);
    // 新员工固定21岁
    float newEmployees = leaveRate * 21;
    // 返回新的平均年龄
    return stayEmployees + newEmployees;
}

int main() {
    int W, N;
    float Y, x;
    
    while (cin >> W >> Y >> x >> N) {
        float averageAge = Y;
        // 模拟N年
        for (int i = 0; i < N; i++) {
            averageAge = calculateNextYear(averageAge, x);
        }
        // 向上取整并输出
        cout << ceil(averageAge) << endl;
    }
    return 0;
}

import java.util.*;

public class Main {
    // 计算一年后的平均年龄
    private static float calculateNextYear(float currentAge, double leaveRate) {
        // 留任员工年龄增长1岁
        float stayEmployees = (float)((1 - leaveRate) * (currentAge + 1));
        // 新员工固定21岁
        float newEmployees = (float)(leaveRate * 21);
        // 返回新的平均年龄
        return stayEmployees + newEmployees;
    }
    
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        
        while (sc.hasNext()) {
            int W = sc.nextInt();
            float Y = sc.nextFloat();
            float x = sc.nextFloat();
            int N = sc.nextInt();
            
            float averageAge = Y;
            // 模拟N年
            for (int i = 0; i < N; i++) {
                averageAge = calculateNextYear(averageAge, x);
            }
            // 向上取整并输出
            System.out.println((int)Math.ceil(averageAge));
        }
    }
}

import math

def calculate_next_year(current_age: float, leave_rate: float) -> float:
    # 留任员工年龄增长1岁
    stay_employees = (1 - leave_rate) * (current_age + 1)
    # 新员工固定21岁
    new_employees = leave_rate * 21
    # 返回新的平均年龄
    return stay_employees + new_employees

while True:
    try:
        # 读取输入
        W, Y, x, N = map(float, input().split())
        N = int(N)  # N需要是整数
        
        average_age = Y
        # 模拟N年
        for _ in range(N):
            average_age = calculate_next_year(average_age, x)
        
        # 向上取整并输出
        print(math.ceil(average_age))
    except EOFError:
        break