countingValleys.java

import java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.regex.*;

public class Solution {

    // Complete the countingValleys function below.
    static int countingValleys(int n, String s) {
        int diff=0;
        int valleyCount=0;
        char[] valleyChar=s.toCharArray();
        for(char ch:valleyChar){
            if('U'==ch){
                diff+=1;
            }else{
                diff-=1;
                if(diff==-1){
                    valleyCount+=1;
                }
            }
        }
        
        return valleyCount;
    }

    private static final Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) throws IOException {
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = scanner.nextInt();
        scanner.skip("(\r\n|[\n\r\u2028\u2029\u0085])?");

        String s = scanner.nextLine();

        int result = countingValleys(n, s);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedWriter.close();

        scanner.close();
    }
}