bird.c

#include <stdio.h>

int main()
{
    int a[100000], count = 0;
    long long int numbers, num1, num2, target; 
    scanf("%lld%lld", &numbers, &target);
    
    for (int i = 0; i < numbers; i++)
        scanf("%d", &a[i]);
    
    for (num1 = 0; num1 < numbers; num1++)
        for (num2 = 1; num2 < numbers; num2++)
            if (count == 0)
                if (num2 > num1)
                    if (a[num1] + a[num2] == target)
                    {
                        printf("%lld %lld\n", num1, num2);
                        count++;
                    }   
    
    if (count == 0)
        printf("%d\n", -1);

    return 0;
}