周赛320

src/main/java/contest/y2022/m11/Week320.java

@@ -0,0 +1,91 @@
+package contest.y2022.m11;
+
+import com.code.leet.entiy.TreeNode;
+
+import java.util.*;
+
+public class Week320 {
+    public static void main(String[] args) {
+        Week320 solution = new Week320();
+    }
+
+    public List<List<Integer>> closestNodes(TreeNode root, List<Integer> queries) {
+        PriorityQueue<Integer> minheap = new PriorityQueue<>();
+        PriorityQueue<Integer> maxheap = new PriorityQueue<>(Collections.reverseOrder());
+        Queue<TreeNode> queue = new LinkedList<>();
+        queue.add(root);
+        while (!queue.isEmpty()) {
+            int size = queue.size();
+            for (int i = 0; i < size; i++) {
+                TreeNode node = queue.poll();
+                minheap.add(node.val);
+                maxheap.add(node.val);
+                if (node.left != null) {
+                    queue.add(node.left);
+                }
+                if (node.right != null) {
+                    queue.add(node.right);
+                }
+            }
+        }
+        int[][] arrs = new int[queries.size()][2];
+        Collections.sort(queries);
+        for (int i = 0; i < queries.size(); i++) {
+            int min = -1;
+            if (minheap.isEmpty()) {
+                arrs[i][0] = -1;
+            } else {
+                min = minheap.poll();
+                while (min <= queries.get(i)) {
+                    if (minheap.isEmpty()) {
+                        break;
+                    }
+                    min = minheap.poll();
+                }
+            }
+            arrs[i][0] = min;
+            int max = -1;
+            if (maxheap.isEmpty()) {
+                arrs[queries.size() - i - 1][0] = -1;
+            } else {
+                max = maxheap.poll();
+                while (max >= queries.get(i)) {
+                    if (maxheap.isEmpty()) {
+                        break;
+                    }
+                    max = maxheap.poll();
+                }
+            }
+            arrs[queries.size() - i - 1][1] = max;
+        }
+        List<List<Integer>> list = new ArrayList<>();
+        for (int[] arr : arrs) {
+            list.add(Arrays.asList(arr[0], arr[1]));
+        }
+        return list;
+    }
+
+    public int unequalTriplets(int[] nums) {
+        Map<Integer, Integer> map = new HashMap<>();
+        for (int num : nums) {
+            map.put(num, map.getOrDefault(num, 0) + 1);
+        }
+        if (map.size() < 3) {
+            return 0;
+        }
+        int res = 0;
+        List<Integer> list = new ArrayList<>();
+        for (int key : map.keySet()) {
+            list.add(map.get(key));
+        }
+        for (int i = 0; i < list.size(); i++) {
+            for (int j = i + 1; j < list.size(); j++) {
+                int tmp = list.get(i) * list.get(j);
+                for (int k = j + 1; k < list.size(); k++) {
+                    res += tmp * list.get(k);
+                }
+            }
+        }
+        return res;
+    }
+}