Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    // Your logic here
    
if (k > n || k <= 0) return;  // no valid windows

    int sum = 0;

    // sum of first window
    for (int i = 0; i < k; i++) sum += arr[i];
    printf("%d", sum);  // print first sum without leading space

    // slide the window
    for (int i = k; i < n; i++) {
        sum += arr[i];        // add new element
        sum -= arr[i - k];    // remove element leaving the window
        printf(" %d", sum);   // print with space before
    }

    
}

int main() {
    int n, k, arr[100];
    scanf("%d %d", &n, &k);
    for (int i = 0; i < n; i++) scanf("%d", &arr[i]);

    sliding_window_sum(arr, n, k);
    return 0;
}

Solving Approach