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package class18;
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// 牛客的测试链接：
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// https://www.nowcoder.com/practice/7201cacf73e7495aa5f88b223bbbf6d1
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// 不要提交包信息，把import底下的类名改成Main，提交下面的代码可以直接通过
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// 因为测试平台会卡空间，所以把set换成了动态加和减的结构
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// 请同学们务必参考如下代码中关于输入、输出的处理
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// 这是输入输出处理效率很高的写法
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import java.io.OutputStreamWriter;
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import java.io.PrintWriter;
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import java.io.StreamTokenizer;
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import java.util.Comparator;
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import java.util.HashSet;
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import java.util.PriorityQueue;
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public class Code04_TopKSumCrossTwoArrays {
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public static void main(String[] args) throws IOException {
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BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
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StreamTokenizer in = new StreamTokenizer(br);
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PrintWriter out = new PrintWriter(new OutputStreamWriter(System.out));
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while (in.nextToken() != StreamTokenizer.TT_EOF) {
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int N = (int) in.nval;
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in.nextToken();
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int K = (int) in.nval;
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int[] arr1 = new int[N];
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int[] arr2 = new int[N];
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for (int i = 0; i < N; i++) {
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in.nextToken();
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arr1[i] = (int) in.nval;
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}
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for (int i = 0; i < N; i++) {
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in.nextToken();
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arr2[i] = (int) in.nval;
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}
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int[] topK = topKSum(arr1, arr2, K);
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for (int i = 0; i < K; i++) {
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out.print(topK[i] + " ");
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}
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out.println();
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out.flush();
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}
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}
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// 放入大根堆中的结构
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public static class Node {
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public int index1;// arr1中的位置
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public int index2;// arr2中的位置
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public int sum;// arr1[index1] + arr2[index2]的值
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public Node(int i1, int i2, int s) {
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index1 = i1;
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index2 = i2;
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sum = s;
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}
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}
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// 生成大根堆的比较器
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public static class MaxHeapComp implements Comparator<Node> {
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@Override
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public int compare(Node o1, Node o2) {
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return o2.sum - o1.sum;
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}
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}
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public static int[] topKSum(int[] arr1, int[] arr2, int topK) {
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if (arr1 == null || arr2 == null || topK < 1) {
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return null;
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}
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int N = arr1.length;
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int M = arr2.length;
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topK = Math.min(topK, N * M);
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int[] res = new int[topK];
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int resIndex = 0;
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PriorityQueue<Node> maxHeap = new PriorityQueue<>(new MaxHeapComp());
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HashSet<String> set = new HashSet<>();
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int i1 = N - 1;
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int i2 = M - 1;
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maxHeap.add(new Node(i1, i2, arr1[i1] + arr2[i2]));
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set.add(i1 + "_" + i2);
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while (resIndex != topK) {
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Node curNode = maxHeap.poll();
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res[resIndex++] = curNode.sum;
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i1 = curNode.index1;
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i2 = curNode.index2;
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set.remove(i1 + "_" + i2);
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if (i1 - 1 >= 0 && !set.contains((i1 - 1) + "_" + i2)) {
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set.add((i1 - 1) + "_" + i2);
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maxHeap.add(new Node(i1 - 1, i2, arr1[i1 - 1] + arr2[i2]));
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}
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if (i2 - 1 >= 0 && !set.contains(i1 + "_" + (i2 - 1))) {
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set.add(i1 + "_" + (i2 - 1));
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maxHeap.add(new Node(i1, i2 - 1, arr1[i1] + arr2[i2 - 1]));
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}
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}
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return res;
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}
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}
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