KOTLIN CODING TEST COURSE, GAME DEVELOPMENT

Problem Description

Problems that frequently appear in coding tests require the use of various algorithms. This problem is based on an algorithmic challenge regarding a game where a player defeats monsters.
Given the health of the monsters and the player’s attack power, the task is to calculate the minimum number of attacks needed for the player to defeat the monsters.
Each monster has unique health, and the player can deal a certain amount of damage with each attack.

Problem

        
        Given N monsters and the player's attack power K, for each monster's health provided,
        write a program to calculate the minimum number of attacks required for the player to defeat all monsters.

        Input format:
        - The first line contains the number of monsters N (1 ≤ N ≤ 10^5) and the attack power K (1 ≤ K ≤ 10^4).
        - The second line provides the health of each monster H[i] (1 ≤ H[i] ≤ 10^5) as N integers.

        Output format:
        - Output the minimum number of attacks needed for the player to defeat the monsters.
        
        

Approach

To solve this problem, we will use the following approach:

1. First, we calculate the number of attacks required to defeat each monster based on the player’s attack power and the monster’s health.
2. After calculating the required attacks for each monster, we sum them up to get the total number of attacks needed to defeat all monsters.
3. Finally, we output the calculated total number of attacks.

Step-by-Step Solution

Step 1: Input Handling

We will input the number of monsters N and the player’s attack power K.
Then, we need to input the health of N monsters as an array. This will be handled using standard input in Kotlin.

Step 2: Calculate Attacks for Each Monster

For each monster’s health H[i], the number of attacks required to defeat the monster can be calculated as (H[i] + K – 1) / K.
This is obtained by dividing the monster’s health by the player’s attack power and rounding up.
For example, if H[i] is 10 and K is 3, the minimum attack count is (10 + 3 – 1) / 3 = 4.

Step 3: Calculate Total Attacks for All Monsters

After obtaining the attack counts for each monster, we can sum them all to get the final total number of attacks needed.

Code

        
        fun main() {
            // Input
            val (N, K) = readLine()!!.split(" ").map { it.toInt() }
            val healthList = readLine()!!.split(" ").map { it.toInt() }

            // Variable to calculate the total required attacks
            var totalAttacks = 0

            // Calculate the required attack counts for each monster
            for (health in healthList) {
                totalAttacks += (health + K - 1) / K  // Rounding up
            }

            // Output the result
            println(totalAttacks)
        }
        
    

Result

Running the code above will output the minimum number of attacks needed for the player to defeat all monsters.
Through this problem, one can understand the relationship between the monster’s health and the player’s attack power, and learn how to approach problems from a mathematical perspective.

Conclusion

In this Kotlin coding test tutorial, we addressed a simple algorithmic problem based on game development.
By combining the necessary mathematical approaches and coding techniques to solve the problem, we can see the importance of writing efficient code and obtaining optimized results.
If we continue to encounter and practice solving a variety of algorithmic problems, we can grow into more professional developers.