Sliding Window Sum

Code

#include <stdio.h>


void sliding_window_sum(int arr[], int n, int k) {
    int res[100] = {0};

    for (int i = 0; i < k; ++i)
        res[0] += arr[i];

    for (int i = 0; i < n - k; ++i)
        res[i + 1] = res[i] - arr[i] + arr[i + k];

    // In kết quả
    for (int i = 0; i <= n - k; ++i)
        printf("%d ", res[i]);
}

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