Minimum Sum.java

import java.util.*;
import java.io.*;

class Main {
    static class FastReader {
        BufferedReader br;
        StringTokenizer st;

        public FastReader() {
            br = new BufferedReader(new InputStreamReader(System.in));
        }

        String next() {
            while (st == null || !st.hasMoreElements()) {
                try {
                    st = new StringTokenizer(br.readLine());
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            return st.nextToken();
        }

        int nextInt() {
            return Integer.parseInt(next());
        }

        long nextLong() {
            return Long.parseLong(next());
        }

        double nextDouble() {
            return Double.parseDouble(next());
        }

        String nextLine() {
            String str = "";
            try {
                str = br.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
            return str;
        }
    }

    public static int call(int[] a, int n, int k) {

        int min = 100000;
        int s = 0;
        for (int i = 0; i < k; i++) {
            s = s + a[i];
        }
        min = s;
        for (int j = k; j < n; j++) {
            s = s - a[j - k] + a[j];

            if (s < min) {
                min = s;
            }

        }
        return min;

    }

    public static void main(String[] args) {

        Scanner sc = new Scanner(System.in);
        int t = sc.nextInt();
        for (int j = 0; j < t; j++) {
            int n = sc.nextInt();
            int k = sc.nextInt();
            int[] a = new int[n];

            for (int i = 0; i < n; i++) {
                a[i] = sc.nextInt();
            }
            System.out.println(call(a, n, k));
        }
    }
}