60. Detect Alternating Pattern

#include <stdio.h>

int is_alternating_pattern(int *mem, int k) {
    int last_num = *(mem+(k-1));
    int last_before_num = *(mem+(k-2));
    k = k-2;
    while(k > 0)
    {
        if((last_num != *(mem+(k-1))) || (last_before_num != *(mem+(k-2))))
          return 0;
        k = k-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;
}