59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) {
    if (n < 3) 
    {
        return -1;
    } 

    int *start = mem;
    int index = 0;

    while (index <= n - 3) 
    {
        if (*(start + 1) == *(start) + 1 && *(start + 2) == *(start + 1) + 1) 
        {
            return index;
        }
        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;
}