题解 | 左侧严格小于计数

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] arr = new int[n];

        for (int i = 0; i < n; i++) {
            arr[i] = sc.nextInt();
        }

        int[] sum = new int[n];

        for (int i = 0; i < n ; i++) { //右侧
            int count = 0;
            for (int j = 0; j < i; j++) { //左侧
                if (arr[j] < arr[i]) {
                    count++;
                }
                sum[i] = count;
            }
        }
        for (int i = 0; i < n; i++) {
            System.out.print(sum[i] + " ");
        }

    }
}