59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    // Write your pointer-based logic here
    int start_index;
    if(mem == NULL)
        return -1;
    else if(n < 3)
    {
        return -1;
    }
    else
    {
        for(int i = 2; i < n; i++)
        {
            if(((*(mem + i) - *(mem + (i - 1))) == 1) && (*(mem + (i - 1)) - *(mem + (i - 2)) == 1))
            {
                start_index = i-2;
                return start_index;
            } 
        }
    }
    return -1;
}

int main() {
    int n, arr[100];
    scanf("%d", &n);

    for (int i = 0; i < n; i++) {
        scanf("%d", &arr[i]);
    }

    int res = find_pattern(arr, n);
    printf("%d", res);

    return 0;
}