题解 | #MP3光标位置#

MP3光标位置

https://www.nowcoder.com/practice/eaf5b886bd6645dd9cfb5406f3753e15

老老实实的进行条件判断就OK了
import java.io.IOException;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) throws IOException {
        Scanner sc = new Scanner(System.in);
        int count = Integer.parseInt(sc.nextLine());
        char[] operates = sc.nextLine().toCharArray();
        int up = 1;
        int down = 4;
        int cur = 1;
        for (char operate : operates) {
            if(count <= 4){
                down = count;
                if (operate == 'U'){
                    if(cur == 1){
                        cur = down;
                    } else {
                        cur--;
                    }
                } else if (operate == 'D'){
                    if(cur == down){
                        cur = 1;
                    }else{
                        cur++;
                    }
                }
            }else{
                if (operate == 'U'){
                    if(cur == 1){
                        cur = count;
                        up = count - 3;
                        down = count;
                    }else if(cur == up){
                        cur--;
                        up--;
                        down--;
                    } else{
                        cur--;
                    }
                } else if (operate == 'D'){
                    if(cur == count){
                        cur = 1;
                        up = 1;
                        down = 4;
                    } else if(cur == down){
                        cur++;
                        up++;
                        down++;
                    } else{
                        cur++;
                    }
                }
            }
        }
        for(int i = up; i <= down; ++i){
            System.out.print(i + " ");
        }
        System.out.println();
        System.out.println(cur);
    }
}


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