Detect Alternating Pattern

Code

#include <stdio.h>

int is_alternating_pattern(int *mem, int k) {
    // Write your pointer logic here
    int first=*(mem+0),err=0,second=*(mem+1);

    for (int i=0;i<k;i++){
        if(i%2 != 0) {
            if (second !=*(mem+i)) err=1;
        } 
        else {
            if(first != *(mem+i)) err=1;
        }
    }
    if (err==1) return 0;
    else 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