Sliding Window Sum

Code

#include <stdio.h>

void sliding_window_sum(int arr[], int n, int k) {
    // Your logic here
    for(int i=1; i<n; i++)
    arr[i]+=arr[i-1];//replacing each element with
                     //sum of itself and all previous elements

    printf("%d ",arr[k-1]);//manually printing 
    for(int i =k;i<n;i++)
    printf("%d ",arr[i]-arr[i-k]);
}
    

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