题解 | #杨辉三角的变形#
杨辉三角的变形
https://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
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 in = new Scanner(System.in); // 注意 hasNext 和 hasNextLine 的区别 while (in.hasNextInt()) { // 注意 while 处理多个 case int a = in.nextInt(); if (a <= 2) { System.out.println(-1); continue; } int r = a % 4; int out = -1; switch (r) { case 3: out = 2; break; case 0: out = 3; break; case 1: out = 2; break; case 2: out = 4; break; } System.out.println(out); } } }