Detect Alternating Pattern

Code

#include <stdio.h>

int is_alternating_pattern(int *mem, int k) {
    if (k < 2) {
        return (*mem == 0 || *mem == 1) ? 1 : 0;
    }

    int *ptr1 = mem;
    int *ptr2 = mem + 1;

    while (ptr2 < mem + k) {
        if ((*ptr1 != 0 && *ptr1 != 1) ||
            (*ptr2 != 0 && *ptr2 != 1)) {
            return 0;
        }
        if (*ptr1 == *ptr2) {
            return 0;
        }

        ptr1++;
        ptr2++;
    }

    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;
}

Solving Approach