Magic Square

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;


List<List<int>> problem = new List<List<int>>()
{ 
    new List<int>(){ 4 ,8 ,2 },
    new List<int>(){ 4 ,5 ,7 },
    new List<int>(){ 6 ,1 ,6 },
};

int[] row1Arr = problem[0].ToArray();
int[] row2Arr = problem[1].ToArray();
int[] row3Arr = problem[2].ToArray();

// int[] inputArr = row1Arr.Join()

// for (int i = 0; i < 3; i++){
//     for (int j = 0; j < 3; j++){
//         if (i == 0)
//             inputArr[i*3 + j] = row1Arr[j];
        
//         if (i == 1)
//             inputArr[i*3 + j] = row2Arr[j];
        
//         if (i == 2)
//             inputArr[i*3 + j] = row3Arr[j];                    
//     }            
// }

int cost = 999;

for (int i = 0; i < 8; i++){
    int [] solArr = GetSolutionArray(i);
    int tempCost = ComputeCost(inputArr, solArr);
    
    if (tempCost < cost)
        cost = tempCost;    
}

Console.WriteLine(cost.ToString());


int ComputeCost(int[] inputArr, int[] checkArr){
    int cost = 0;
    
    for (int i = 0; i < 9; i++){
        cost += Math.Abs(inputArr[i] - checkArr[i]);
    }
    
    return cost;
}
    
int[] GetSolutionArray(int solutionArray){

    int[] sol0 = {2,9,4,
                    7,5,3,
                    6,1,8};
    
    int[] sol1 = {2,7,6,
                    9,5,1,
                    4,3,8};
    
    int[] sol2 = {4,9,2,
                    3,5,7,
                    8,1,6};
    
    int[] sol3 = {8,3,4,
                    1,5,9,
                    6,7,2};        
    
    int[] sol4 = {6,1,8,
                    7,5,3,
                    2,9,4};
    
    int[] sol5 = {6,7,2,
                    1,5,9,
                    8,3,4};
    
    int[] sol6 = {4,3,8,
                    9,5,1,
                    2,7,6};
    
    int[] sol7 = {8,1,6,
                    3,5,7,
                    4,9,2};
    
    switch (solutionArray){        
        case 0:    
        return sol0;
        
        case 1:    
        return sol1;
        
        case 2:    
        return sol2;
        
        case 3:    
        return sol3;
        
        case 4:    
        return sol4;
        
        case 5:    
        return sol5;
        
        case 6:    
        return sol6;
        
        case 7:    
        return sol7;
        
        default:
        return null;
    }            
}