Submission #1407989

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Source Code Expand

import java.util.Scanner;

public class Main {
    void run() {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        int count = 0;
        for (int i = 0; i < n; i++) {
            String str = scan.next();
            if (str.equals("A"))
                count++;
            else
                count--;
            if (count < 0)
                break;
        }
        if (count == 0)
            System.out.println("YES");
        else
            System.out.println("NO");
    }
    public static void main(String[] args) {
        new Main().run();
    }
}

Submission Info

Judge Result