Counting Valleys in Algorithm | HackerRank Programming Solutions | HackerRank Problem Solving Solutions in Java [💯Correct]

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Introduction To Algorithm

The word Algorithm means “a process or set of rules to be followed in calculations or other problem-solving operations”. Therefore Algorithm refers to a set of rules/instructions that step-by-step define how a work is to be executed upon in order to get the expected results. 

Advantages of Algorithms:

  • It is easy to understand.
  • Algorithm is a step-wise representation of a solution to a given problem.
  • In Algorithm the problem is broken down into smaller pieces or steps hence, it is easier for the programmer to convert it into an actual program.

Link for the ProblemCounting Valleys – Hacker Rank Solution

Counting Valleys – Hacker Rank Solution


An avid hiker keeps meticulous records of their hikes. During the last hike that took exactly  steps, for every step it was noted if it was an uphill, , or a downhill,  step. Hikes always start and end at sea level, and each step up or down represents a  unit change in altitude. We define the following terms:

  • mountain is a sequence of consecutive steps above sea level, starting with a step up from sea level and ending with a step down to sea level.
  • valley is a sequence of consecutive steps below sea level, starting with a step down from sea level and ending with a step up to sea level.

Given the sequence of up and down steps during a hike, find and print the number of valleys walked through.


The hiker first enters a valley  units deep. Then they climb out and up onto a mountain  units high. Finally, the hiker returns to sea level and ends the hike.

Function Description

Complete the countingValleys function in the editor below.

countingValleys has the following parameter(s):

  • int steps: the number of steps on the hike
  • string path: a string describing the path


  • int: the number of valleys traversed

Input Format

The first line contains an integer , the number of steps in the hike.
The second line contains a single string , of  characters that describe the path.


image 65

Sample Input


Sample Output



If we represent _ as sea level, a step up as /, and a step down as \, the hike can be drawn as:

_/\      _
   \    /

The hiker enters and leaves one valley.

Counting Valleys – Hacker Rank Solution
import java.util.Scanner;

 * @author Techno-RJ
public class CountingValleys {

	static int countingValleys(int n, String s) {

		int valleyCounter = 0, altitude = 0;

		for (int i = 0; i < n; i++) {
			char ch = s.charAt(i);
			if (ch == 'U') {
				if (altitude == 0) {

			} else {

		return valleyCounter;

	public static void main(String[] args) {
		Scanner sc = new Scanner(;
		int n = sc.nextInt();
		String str =;
		System.out.println(countingValleys(n, str));

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