Detect Alternating Pattern

Code

#include <stdio.h>

int is_alternating_pattern(int *mem, int k) {
    // Write your pointer logic here
    int *base = mem;     // pointer to first element
    int *p = mem;        // scanning pointer

    // Traverse only the first k elements
    while (p < base + k) {
        int offset = p - base;  // pointer difference gives index
        int expected = (*base + offset) % 2;

        if (*p != expected) {
            return 0;   // mismatch → not alternating
        }
        p++; // move pointer to next element
    }

    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