注意是多组测试，只输入一组的话，通过率是20%
import java.util.*;
public class Main{
public static void main(String []args){
Scanner sc=new Scanner(System.in);
while(sc.hasNextInt()) {
int n=sc.nextInt();
boolean flag=false;
int [] a=new int[n];
for(int i=0;i<a.length;i++){
a[i]=sc.nextInt();
}
int search=sc.nextInt();
for(int i=0;i<a.length;i++){
if(search==a[i]){
System.out.println(i);
flag=true;
break;
}
}
if(!flag){
System.out.println("No");
}
}
}
}