题解 | #MP3光标位置#
MP3光标位置
https://www.nowcoder.com/practice/eaf5b886bd6645dd9cfb5406f3753e15
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
while(scan.hasNext())
{
int num= scan.nextInt();
String cmd = scan.next();
char[] arr=cmd.toCharArray();
int pageSize = Math.min(4, num);
int pageIndex=1;
int songIndex=1;
for(int i=0; i< arr.length; i++)
{
char curCh = arr[i];
if(curCh=='U')
{
if(pageIndex!=1)
{
pageIndex--;
}else
{
if(songIndex==1)
{
pageIndex= pageSize;
}
}
if(songIndex==1)
{
songIndex=num;
}else
{
songIndex--;
}
}
else//cmd D
{
if(pageIndex!=pageSize)
{
pageIndex++;
}else
{
if(songIndex==num)
{
pageIndex=1;
}
}
if(songIndex==num)
{
songIndex = 1;
}else
{
songIndex++;
}
}
}
int songBefore = pageIndex-1;
int songAfter = pageSize-pageIndex;
int StartIndex = songIndex-songBefore;
int EndIndex = songIndex+songAfter;
for(int i = StartIndex; i<=EndIndex; i++)
{
System.out.print(i+" ");
}
System.out.println();
System.out.println(songIndex);
}
}
}
public class Main {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner scan = new Scanner(System.in);
while(scan.hasNext())
{
int num= scan.nextInt();
String cmd = scan.next();
char[] arr=cmd.toCharArray();
int pageSize = Math.min(4, num);
int pageIndex=1;
int songIndex=1;
for(int i=0; i< arr.length; i++)
{
char curCh = arr[i];
if(curCh=='U')
{
if(pageIndex!=1)
{
pageIndex--;
}else
{
if(songIndex==1)
{
pageIndex= pageSize;
}
}
if(songIndex==1)
{
songIndex=num;
}else
{
songIndex--;
}
}
else//cmd D
{
if(pageIndex!=pageSize)
{
pageIndex++;
}else
{
if(songIndex==num)
{
pageIndex=1;
}
}
if(songIndex==num)
{
songIndex = 1;
}else
{
songIndex++;
}
}
}
int songBefore = pageIndex-1;
int songAfter = pageSize-pageIndex;
int StartIndex = songIndex-songBefore;
int EndIndex = songIndex+songAfter;
for(int i = StartIndex; i<=EndIndex; i++)
{
System.out.print(i+" ");
}
System.out.println();
System.out.println(songIndex);
}
}
}
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