题解 | #杨辉三角的变形#
杨辉三角的变形
http://www.nowcoder.com/practice/8ef655edf42d4e08b44be4d777edbf43
import java.util.Scanner;
public class Main {
public static void main(String[] args) throws Exception {
Scanner sc = new Scanner(System.in);
int line = 0;
int a = 0;
while(true){
if(sc.hasNextInt()){
line = sc.nextInt();
if(line > 0){
switch(line){
case 1:
case 2:System.out.println("-1");break;
default: {
a = line - 2;
a = a%4;
switch(a){
case 0: System.out.println("4");break;
case 1:
case 3: System.out.println("2");break;
case 2: System.out.println("3");break;
}
}
}
}else System.out.println("不是正整数");
}else break;
}
sc.close();
}
}
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