cf 578 A

[hitolz]

https://codeforces.com/contest/1200/problem/A 题目内容： 说一个宾馆10个房间，从左到右标记为0-9，宾馆有两个入口，可以从左边进(L)，也可以从右边进(R)，数字表示对应的房间的人离开，输出这10个房间的状态，0表示没人，1表示有人。

import java.util.Scanner;

public class Cf578A {
    static int n;

    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);
        n = scanner.nextInt();
        scanner.nextLine();
        String input = scanner.nextLine();
        int[] room = new int[10];
        for (int i = 0; i < n; i++) {
            char c = input.charAt(i);
            if ('L' == c) {
                inFromLeft(room);
            } else if ('R' == c) {
                inFromRight(room);
            } else {
                leave(room, c);
            }
        }
        print(room);
    }

    private static void print(int[] room) {
        for (int i = 0; i <= 9; i++) {
            System.out.print(room[i]);
        }
    }

    private static void leave(int[] room, char c) {
        int num = Integer.parseInt(String.valueOf(c));
        room[num] = 0;
    }

    private static void inFromRight(int[] room) {
        for (int i = 9; i >= 0; i--) {
            if (room[i] == 0) {
                room[i] = 1;
                break;
            }
        }
    }

    private static void inFromLeft(int[] room) {
        for (int i = 0; i <= 9; i++) {
            if (room[i] == 0) {
                room[i] = 1;
                break;
            }
        }
    }
}