triangle.c

// you can write to stdout for debugging purposes, e.g.
// printf("this is a debug message\n");

int compare (const void * a, const void * b)
{
    return (*(int*)a >= *(int*)b ? 1 : 0);
}

int solution(int A[], int N) {
    // write your code in C99 (gcc 6.2.0)
    
    if (N < 3) return 0;
    
    qsort (A, N, sizeof(int), compare);
    
    for (int i = 0; i < N - 2; i++)
    {
        if ((A[i] > 0) && (((double)A[i] + A[i + 1]) > A[i+2]))
        {
            return 1;
        }
    }
    
    return 0;
}