C# Coding Test Course, Helping the Less Fortunate

Hello! Today, we will take some time to solve an easy algorithm problem related to helping the less fortunate using C#. In this course, we will cover various aspects including problem definition, approach to solving the problem, algorithm implementation, and optimized code.

Problem Definition

Approach to Solving the Problem

The core of this problem is to check whether we can reach the target amount with the given donations. We can solve the problem using the following steps:

1. Calculate the sum of the amounts donated by the contributors.
2. If the sum is greater than or equal to the target amount, we have achieved the goal, so return true.
3. Otherwise, return false.

Algorithm Implementation

Now, let’s implement the above approach in C# code.

using System;

class Program
{
    static void Main(string[] args)
    {
        int goal = 100000; // Target amount
        int[] donations = { 25000, 30000, 50000, 35000 }; // Contributors' donation history

        bool result = CanAchieveGoal(goal, donations);
        Console.WriteLine(result ? "We have achieved the goal!" : "We did not achieve the goal.");
    }

    static bool CanAchieveGoal(int goal, int[] donations)
    {
        int total = 0;
        foreach (var donation in donations)
        {
            total += donation;
        }
        return total >= goal;
    }
}

Code Analysis

The above code first defines the target amount and the contributors’ donation history. Then, it calculates the total amount of donations using the CanAchieveGoal function, compares it with the target amount, and prints the final result. This code is straightforward and easy to understand.

Performance Optimization

The current code has a time complexity of O(n) depending on the length of the donation history. There won’t be performance issues even if the number of contributors increases. However, if further optimization is needed, for example, a way to confirm early that we have reached the target amount, we can stop the loop when the total reaches the goal.

static bool CanAchieveGoal(int goal, int[] donations)
{
    int total = 0;
    foreach (var donation in donations)
    {
        total += donation;
        if (total >= goal)
        {
            return true; // Confirm the goal has been achieved early
        }
    }
    return false;
}

Conclusion

In this article, we solved an algorithm problem to determine whether we can achieve a donation goal related to helping the less fortunate using C#. We explored various approaches, implementation code, and performance optimization. Such problems are often presented in actual coding tests, so sufficient practice is necessary.

Finally, I hope that through this course, you learned valuable insights about donations and the basics of C# programming. I will return with more problems in the next session. Thank you!