using System;
public class Program
{
public static void Main()
var arr = new[]{1,3,12,4,5};
int goal = 7;
int sum = 0;
int p1 = 0;
int p2=0;
for(int i=0;i<arr.Length; i++)
for(int j=i+1;j<arr.Length-(i+1); j++)
sum = arr[i] + arr[j];
if(sum==goal)
p1 = i;
p2 = j;
break;
}
Console.WriteLine($"{j} {arr[j]}");
if(sum == goal)
Console.WriteLine($"{sum} {p1}:{p2}");