programming assignment vp542019

using System.IO;
using System;

class Program
{
    static void Main()
    {
        Console.WriteLine("Programming Assignment, Viktori Patalainen");
        Problem1();
        Problem3();
    }
    
    static void Problem1() 
    {
        int a = 3;
        int b = 5;
        int c = a * b;
        int result = 0;
        
        for (int i = 199; i > 0; i--) 
        {
            result += b * i;
        }
        
        for (int j = 333; j > 0; j--) 
        {
            result += a * j;
        }
        
        int subs = 0;
        
        for (int k = 66; k > 0; k--) 
        {
            subs += k * c;
        }
        
        int sum = result - subs;
        
        Console.WriteLine(sum);
    }
    
    static void Problem3() 
    {
        int[] test = {1,3,5,7,9,12,2,4,6,8};
        
        int sum = ArrayPairSum(test);
        
        Console.WriteLine(sum);
    }
    
    static int ArrayPairSum(int[] nums) 
    {
        Array.Sort(nums);
        
        int sum = 0;
        
        for (int i = 0; i < nums.Length; i+=2) 
        {
            sum += Math.Min(nums[i], nums[i+1]);
        }
        
        return sum;
    }
    
}