已交

exercise/src/Main.java

@@ -3,41 +3,30 @@ import java.util.Scanner;
 public class Main {
     public static void main(String[] args) {
         Scanner in = new Scanner(System.in);
-        int n = in.nextInt();
-        int[] mention = new int[101];
-        boolean[][] by = new boolean[101][101];
-        for (int i = 0; i < n; i++) {
-            int sender = in.nextInt();
-            int k = in.nextInt();
-            for (int j = 0; j < k; j++) {
-                int id = in.nextInt();
-                if (id >= 0 && id <= 100) {
-                    mention[id]++;
-                    if (sender >= 0 && sender <= 100)
-                        by[id][sender] = true;
+        if (in.hasNextInt()) {
+            int n = in.nextInt();
+            int[] arr = new int[n];
+            for (int i = 0; i < n; i++) {
+                arr[i] = in.nextInt();
+            }
+
+            // 题目要求计算最少交换次数，即逆序对的数量
+            // 使用冒泡排序的交换次数来统计
+            int swaps = 0;
+            for (int i = 0; i < n - 1; i++) {
+                for (int j = 0; j < n - 1 - i; j++) {
+                    if (arr[j] > arr[j + 1]) {
+                        // 交换
+                        int temp = arr[j];
+                        arr[j] = arr[j + 1];
+                        arr[j + 1] = temp;
+                        swaps++;
+                    }
                 }
             }
+
+            System.out.println(swaps);
         }
-        int bestId = 0;
-        int bestCount = -1;
-        for (int id = 0; id <= 100; id++) {
-            if (mention[id] > bestCount) {
-                bestCount = mention[id];
-                bestId = id;
-            }
-        }
-        System.out.println(bestId);
-        StringBuilder sb = new StringBuilder();
-        boolean first = true;
-        for (int s = 0; s <= 100; s++) {
-            if (by[bestId][s]) {
-                if (!first)
-                    sb.append(' ');
-                sb.append(s);
-                first = false;
-            }
-        }
-        System.out.println(sb.toString());
         in.close();
     }
 }