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  1. Counting Valleys
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Counting Valleys

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191 Discussions

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  • aditya_sharma_26
     + 0 comments

    This is my java code which is easy to understand.

    public static int countingValleys(int steps, String path) {
        int valleyCount = 0;
        
        boolean valleyEntered = false;
        int level = 0;
        for(int i=0; i<steps; i++){
            if(path.charAt(i)== 'U') level++;
            else level--;
            
            if(level < 0) valleyEntered = true;
            if(valleyEntered == true && level == 0){
                valleyCount++;
                valleyEntered = false;
            }
        }
        return valleyCount;
    }

  • gyetomi93
     + 0 comments

    My Java solution:

     public static int countingValleys(int steps, String path) {
        int  currentLevel    = 0;
        char down            = 'D';
        int  numberOfValleys = 0;

        for (Character c : path.toCharArray()) {
            int step = c == down ? -1 : 1;
            if (currentLevel < 0 && (currentLevel + step) == 0) {
                numberOfValleys++;
            }
            currentLevel += step;
        }
        return numberOfValleys;
    }

  • gyetomi93
     + 0 comments

    My Java solution:

    public static int countingValleys(int steps, String path) { int currentLevel = 0; char down = 'D'; int numberOfValleys = 0;

        for (Character c : path.toCharArray()) {
        int step = c == down ? -1 : 1;
        if (currentLevel < 0 && (currentLevel + step) == 0) {
            numberOfValleys++;
        }
        currentLevel += step;
    }
    return numberOfValleys;
}

  • villamilluis123
     + 0 comments

    In C#

    public static int countingValleys(int steps, string path)
    {
        if((steps < 2 || steps > Math.Pow(10, 6)) && !path.Contains('U') || !path.Contains('D')) throw new Exception("Pasos invaldos");
        
        
        int countVa = 0;
        
        int level = 0;

        for(int i = 0; i<steps; i++){
            
            if(path[i] == 'U') level++;
            if(path[i] == 'D') level--;
            
            if(path[i] == 'U' && level == 0) countVa++;
        }
        
        return countVa;
    }

  • juanp766
     + 0 comments

    A valley is counted each time the hiker is at sea level and goes down. We just need to keep track of the current altitude to know that.

        public static int countingValleys(int steps, String path) {
        int numberOfValleys = 0;
        int position = 0;
        for(int i = 0; i<path.length(); i++){
            int direction = path.charAt(i) == 'U' ? 1 : -1;
            if(position == 0 && direction < 0){
                numberOfValleys++;
            }
            
            position += direction;
        }
        
        return numberOfValleys;
    }