59. Scan Memory for Three Consecutive Increasing Values

#include <stdio.h>

int find_pattern(int *mem, int n) 
{
    for ( size_t i = 0; i < n -2; ++i )
    {
        if ((*(mem + i) + 1) == *(mem + i + 1) &&
            (*(mem + i + 1) +1) == *(mem + i + 2))
            {
                return i;
            }
    }
    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;
}