60. Detect Alternating Pattern

#include <stdio.h>

int is_alternating_pattern(int *ptr, int n) {
    int i = 0;
    while (i + 2 < n - 1)
    {
        int current = *(ptr + i);
        int next = *(ptr + i+1);
        int c_pos2 = *(ptr + i+2);
        int n_pos2 = *(ptr + i+3);

        //printf("%i %i %i %i\n", current, next, c_pos2, n_pos2);

        if (!(current == c_pos2 && next == n_pos2)) {
            return 0;
        }
        i=i+2;
    }

    return 1;
}

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

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

    int res = is_alternating_pattern(arr, k);
    printf("%d", res);

    return 0;
}