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public static void main(String[] args) throws IOException {
	BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
	StringTokenizer st = new StringTokenizer(br.readLine());

	int day = Integer.parseInt(st.nextToken());
	int x = Integer.parseInt(st.nextToken());
	int[] prefixSum = new int[day];

	st = new StringTokenizer(br.readLine());
	prefixSum[0] = Integer.parseInt(st.nextToken());
	for (int i = 1; i < day; i++) {
		prefixSum[i] = Integer.parseInt(st.nextToken()) + prefixSum[i - 1];
	}
	
	int maxSum = prefixSum[x - 1];
	int count = 1;
	for (int i = x; i < day; i++) {
		int currentSum = prefixSum[i] - prefixSum[i - x];
		if (currentSum > maxSum) {
			maxSum = currentSum;
			count = 1;
		} else if (currentSum == maxSum) {
			count++;
		}
	}

	if (maxSum == 0) {
		System.out.println("SAD");
	} else {
		System.out.println(maxSum);
		System.out.println(count);
	}
}

출처:https://www.acmicpc.net/problem/21921