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package class40;
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import java.util.Arrays;
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import java.util.PriorityQueue;
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// 给定int[][] meetings，比如
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// {
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// {66, 70} 0号会议截止时间66，获得收益70
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// {25, 90} 1号会议截止时间25，获得收益90
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// {50, 30} 2号会议截止时间50，获得收益30
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// }
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// 一开始的时间是0，任何会议都持续10的时间，但是一个会议一定要在该会议截止时间之前开始
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// 只有一个会议室，任何会议不能共用会议室，一旦一个会议被正确安排，将获得这个会议的收益
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// 请返回最大的收益
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public class Code03_MaxMeetingScore {
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public static int maxScore1(int[][] meetings) {
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Arrays.sort(meetings, (a, b) -> a[0] - b[0]);
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int[][] path = new int[meetings.length][];
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int size = 0;
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return process1(meetings, 0, path, size);
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}
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public static int process1(int[][] meetings, int index, int[][] path, int size) {
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if (index == meetings.length) {
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int time = 0;
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int ans = 0;
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for (int i = 0; i < size; i++) {
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if (time + 10 <= path[i][0]) {
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ans += path[i][1];
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time += 10;
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} else {
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return 0;
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}
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}
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return ans;
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}
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int p1 = process1(meetings, index + 1, path, size);
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path[size] = meetings[index];
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int p2 = process1(meetings, index + 1, path, size + 1);
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// path[size] = null;
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return Math.max(p1, p2);
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}
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public static int maxScore2(int[][] meetings) {
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Arrays.sort(meetings, (a, b) -> a[0] - b[0]);
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PriorityQueue<Integer> heap = new PriorityQueue<>();
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int time = 0;
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// 已经把所有会议，按照截止时间，从小到大，排序了！
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// 截止时间一样的，谁排前谁排后，无所谓
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for (int i = 0; i < meetings.length; i++) {
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if (time + 10 <= meetings[i][0]) {
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heap.add(meetings[i][1]);
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time += 10;
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} else {
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if (!heap.isEmpty() && heap.peek() < meetings[i][1]) {
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heap.poll();
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heap.add(meetings[i][1]);
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}
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}
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}
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int ans = 0;
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while (!heap.isEmpty()) {
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ans += heap.poll();
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}
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return ans;
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}
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public static int[][] randomMeetings(int n, int t, int s) {
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int[][] ans = new int[n][2];
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for (int i = 0; i < n; i++) {
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ans[i][0] = (int) (Math.random() * t) + 1;
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ans[i][1] = (int) (Math.random() * s) + 1;
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}
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return ans;
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}
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public static int[][] copyMeetings(int[][] meetings) {
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int n = meetings.length;
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int[][] ans = new int[n][2];
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for (int i = 0; i < n; i++) {
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ans[i][0] = meetings[i][0];
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ans[i][1] = meetings[i][1];
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}
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return ans;
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}
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public static void main(String[] args) {
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int n = 12;
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int t = 100;
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int s = 500;
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int testTime = 10000;
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System.out.println("测试开始");
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for (int i = 0; i < testTime; i++) {
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int size = (int) (Math.random() * n) + 1;
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int[][] meetings1 = randomMeetings(size, t, s);
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int[][] meetings2 = copyMeetings(meetings1);
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int ans1 = maxScore1(meetings1);
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int ans2 = maxScore2(meetings2);
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if (ans1 != ans2) {
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System.out.println("出错了!");
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System.out.println(ans1);
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System.out.println(ans2);
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}
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}
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System.out.println("测试结束");
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}
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}
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