Scan Memory for Three Consecutive Increasing Values

Code

#include <stdio.h>

int find_pattern(int *mem, int n) {
    // Write your pointer-based logic here
    if (n < 3) {
        return -1;
    }

    int last = *mem; 
    int l = 0;
    int r = 1;
    mem++;
    int consec = 0;

    while (r < n) {

        if (*mem != last + 1) {
            l = r;
            consec = 0;
        } else {
            consec++;
            if (consec == 2) {
                return l;
            }
        }
        last = *(mem);
        r++;
        mem++;
    }
    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;
}

Solving Approach