Consonant and Vowel group check in String with Wildcard characters

Last Updated : 26 Oct, 2023

Given a string S which is composed of lowercase alphabets and wildcard characters i.e. '?'. Here, '?' can be replaced by any of the lowercase alphabets, the task is to return 'True' if there are more than 3 consonants together or more than 5 vowels together else 'False'.

Examples:

Input: S = aeioup??
Output: 0

Input: S = bcdaeiou??
Output: 1

Approach: Follow the steps to solve the problem:

Create a boolean function that will check whether a character is a vowel or not.
Initialize the count of vowels & consonants as 0.
Traverse through the string and do the following:
- If a character is a vowel then increase v, if it is a '?' then increase both v and c else increase only c.
- If the count of v exceeds 5 or the count of c exceeds 3 then print '0' else print '1'.

Below is the implementation for the above approach:

C++

// C++ code for the above approach:
#include <iostream>
#include <string>

using namespace std;

bool vowel(char c)
{
    if (c == 'a' || c == 'e' || c == 'i' || c == 'o'
        || c == 'u') {
        return true;
    }
    return false;
}

bool isValid(string S)
{
    int v = 0, c = 0;
    for (int i = 0; i < S.length(); i++) {
        char ch = S[i];
        if (vowel(ch)) {
            c = 0;
            v++;
        }
        else if (ch == '?') {
            v++;
            c++;
        }
        else {
            v = 0;
            c++;
        }
        if (v > 5 || c > 3) {
            return true;
        }
    }
    return false;
}

// Drivers code
int main()
{
    string s = "bcdaeiou??";

    // Function Call
    cout << isValid(s) << endl;
    return 0;
}

#include <stdio.h>
#include <stdbool.h>

bool vowel(char c) {
    if(c=='a' || c=='e' || c=='i' || c=='o'|| c=='u') {
        return true;
    } 
    return false;
}

char* isGoodorBad(char* S) {
    int v=0,c=0;
    for(int i=0;S[i]!='\0';i++) {
        char ch=S[i];
        if(vowel(ch)) {
            c=0;
            v++;
        }
        else if(ch=='?') {
            v++;
            c++;
        }
        else {
            v=0;
            c++;
        }
        if(v>5 || c>3) {
            return "String is Bad";
        }
    }
    return "String is Good";
}

int main() {
    char s[] = "bcdaeiou??";
    printf("%s\n", isGoodorBad(s));
    return 0;
}

Java

import java.io.*;

class GFG {
    public static void main(String[] args)
    {
        String s = "bcdaeiou??";
        System.out.println(isGoodorBad(s));
    }
    static boolean vowel(char c)
    {
        if (c == 'a' || c == 'e' || c == 'i' || c == 'o'
            || c == 'u') {
            return true;
        }
        return false;
    }
    static String isGoodorBad(String S)
    {
        int v = 0, c = 0;
        for (int i = 0; i < S.length(); i++) {
            char ch = S.charAt(i);
            if (vowel(ch)) {
                c = 0;
                v++;
            }
            else if (ch == '?') {
                v++;
                c++;
            }
            else {
                v = 0;
                c++;
            }
            if (v > 5 || c > 3) {
                return "String is Bad";
            }
        }
        return "String is Good";
    }
}

Python3

def main():
    s = "bcdaeiou??"
    print(is_good_or_bad(s))

def vowel(c):
    if c == 'a' or c == 'e' or c == 'i' or c == 'o' or c == 'u':
        return True
    return False

def is_good_or_bad(S):
    v = 0
    c = 0
    for i in range(len(S)):
        ch = S[i]
        if vowel(ch):
            c = 0
            v += 1
        elif ch == '?':
            v += 1
            c += 1
        else:
            v = 0
            c += 1
        if v > 5 or c > 3:
            return "String is Bad"
    return "String is Good"

if __name__ == "__main__":
    main()

using System;

class Program
{
    static void Main()
    {
        string s = "bcdaeiou??";
        Console.WriteLine(IsGoodOrBad(s));
    }

      // Boolean function that check character is vowel or not
    static bool Vowel(char c)
    {
        if (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u')
        {
            return true;
        }
        return false;
    }

    static string IsGoodOrBad(string S)
    {
          // initial variable to store vowel and 
        // consonant number
        int v = 0;
        int c = 0;
      
          // iterate over string
        for (int i = 0; i < S.Length; i++)
        {
              // Check character is vowel or not
            char ch = S[i];
            if (Vowel(ch))
            {
              // If vowel increse v
              // and assign cosonant to 0
                c = 0;
                v += 1;
            }
            else if (ch == '?')
            {
                  // if character is '?' then increase
                // both vowel and consonant count by 1
                v += 1;
                c += 1;
            }
            else
            {
                  // Else increase consonant by 1 and 
                // make vowel 0
                v = 0;
                c += 1;
            }
              // Check condition for bad string
            if (v > 5 || c > 3)
            {
                return "String is Bad";
            }
        }
        return "String is Good";
    }
}

JavaScript

// function to check whether character is vowel or not
function vowel(c) {
    if (c === 'a' || c === 'e' || c === 'i' || c === 'o' || c === 'u') {
        return true;
    }
    return false;
}


function isValid(S) {
    // initalize vowel and consonants as 0 
    let v = 0, c = 0;
    
    // Traverse through the string
    for (let i = 0; i < S.length; i++) {
        let ch = S[i];
        if (vowel(ch)) {
            c = 0;
            v++;
        } else if (ch === '?') {
            v++;
            c++;
        } else {
            v = 0;
            c++;
        }
        // If count of vowel exceeds 5 or count of consonants exceeds 3 then
        // Return Bad string else return Good string
        if (v > 5 || c > 3) {
            return "String is Bad";
        }
    }
    return "String is Good";
}

let s = "bcdaeiou??";

console.log(isValid(s));

Output

Time Complexity: O(N)
Auxiliary Space: O(1)

Count strings with consonants and vowels at alternate position

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Consonant and Vowel group check in String with Wildcard characters

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