题目要求

P5831题目链接

AC代码（Java语言描述）

import java.util.Scanner;public class Main {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);int line = scanner.nextInt(), num = scanner.nextInt(), counter = 0;int[] array = new int[21];boolean book[][] = new boolean[21][21];for (int p = line; p > 0; p--) {for(int i = 1; i <= num; i++) {array[i] = scanner.nextInt();}for(int i = 1; i <= num; i++) {book[array[i]][array[i]] = true;}for(int i = 1; i <= num; i++) {for(int j = i+1; j <= num; j++) {book[array[j]][array[i]] = true;}}}for(int i = 1; i <= num; i++) {for(int j = 1; j <= num; j++) {if(!book[i][j]) {counter++;}}}System.out.println(counter);scanner.close();} }

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