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Check if the frequency of any character is more than half the length of the string
• Last Updated : 22 Apr, 2021

Given a string str, the task is to check if the frequency of any character is more than half the length of the given string. The characters can be lowercase or uppercase alphabets, digits and special characters.

Examples:

Input: str = “AAa*2AAAA”
Output: Yes
The frequency of ‘A’ is more than half the length of the string.

Input: str = “abB@2a”
Output: No

Approach: The problem can be easily solved by using a frequency array of length 28 i.e. 256 as there are 256 different characters. Iterate through the string and increase the count of the character by one in the frequency array every time it is encountered. Finally, iterate through the frequency array to check if the frequency of any character is more than half the length of the string.

Below is the implementation of the above approach:

## C++

 `// C++ implementation of the approach``#include ``using` `namespace` `std;``#define MAXN 256` `// Function that returns true if the frequency``// of any character is more than half the``// length of the string``bool` `checkHalfFrequency(string str)``{` `    ``// Length of the string``    ``int` `L = str.size();` `    ``// Initialize a frequency array``    ``int` `fre[MAXN] = { 0 };` `    ``// Iterate the string and update the``    ``// frequency of each of the character``    ``for` `(``int` `i = 0; i < L; i++)``        ``fre[str[i]]++;` `    ``// Iterate the frequency array``    ``for` `(``int` `i = 0; i < MAXN; i++)` `        ``// If condition is satisfied``        ``if` `(fre[i] > L / 2)``            ``return` `true``;` `    ``return` `false``;``}` `// Driver code``int` `main()``{``    ``string str = ``"GeeksforGeeks"``;` `    ``if` `(checkHalfFrequency(str))``        ``cout << ``"Yes"``;``    ``else``        ``cout << ``"No"``;` `    ``return` `0;``}`

## Java

 `// Java implementation of the approach` `class` `GFG``{` `    ``static` `int` `MAXN = ``256``;` `    ``// Function that returns true if the frequency``    ``// of any character is more than half the``    ``// length of the string``    ``static` `boolean` `checkHalfFrequency(String str)``    ``{` `        ``// Length of the string``        ``int` `L = str.length();` `        ``// Initialize a frequency array``        ``int` `fre[] = ``new` `int``[MAXN];` `        ``// Iterate the string and update the``        ``// frequency of each of the character``        ``for` `(``int` `i = ``0``; i < L; i++)``        ``{``            ``fre[str.charAt(i)]++;``        ``}` `        ``// Iterate the frequency array``        ``for` `(``int` `i = ``0``; i < MAXN; i++) ``// If condition is satisfied``        ``{``            ``if` `(fre[i] > L / ``2``)``            ``{``                ``return` `true``;``            ``}``        ``}` `        ``return` `false``;``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``String str = ``"GeeksforGeeks"``;` `        ``if` `(checkHalfFrequency(str))``        ``{``            ``System.out.println(``"Yes"``);``        ``}``        ``else``        ``{``            ``System.out.println(``"No"``);``        ``}``    ``}``}` `/* This code contributed by PrinciRaj1992 */`

## Python3

 `# Python3 implementation of the approach``MAXN ``=` `256` `# Function that returns true if the frequency``# of any character is more than half the``# length of the String``def` `checkHalfFrequency(``Str``):` `    ``# Length of the String``    ``L ``=` `len``(``Str``)` `    ``# Initialize a frequency array``    ``fre ``=` `[``0` `for` `i ``in` `range``(MAXN)]` `    ``# Iterate the and update the``    ``# frequency of each of the character``    ``for` `i ``in` `range``(L):``        ``fre[``ord``(``Str``[i])] ``+``=` `1` `    ``# Iterate the frequency array``    ``for` `i ``in` `range``(MAXN):` `        ``# If condition is satisfied``        ``if` `(fre[i] > L ``/``/` `2``):``            ``return` `True` `    ``return` `False` `# Driver code``Str` `=` `"GeeksforGeeks"` `if` `(checkHalfFrequency(``Str``)):``    ``print``(``"Yes"``)``else``:``    ``print``(``"No"``)` `# This code is contributed by mohit kumar`

## C#

 `// C# implementation of the approach``using` `System;` `class` `GFG``{` `    ``static` `int` `MAXN = 256;` `    ``// Function that returns true if the frequency``    ``// of any character is more than half the``    ``// length of the string``    ``static` `bool` `checkHalfFrequency(``string` `str)``    ``{` `        ``// Length of the string``        ``int` `L = str.Length;` `        ``// Initialize a frequency array``        ``int``[] fre = ``new` `int``[MAXN];` `        ``// Iterate the string and update the``        ``// frequency of each of the character``        ``for` `(``int` `i = 0; i < L; i++)``        ``{``            ``fre[str[i]]++;``        ``}` `        ``// Iterate the frequency array``        ``for` `(``int` `i = 0; i < MAXN; i++) ``// If condition is satisfied``        ``{``            ``if` `(fre[i] > L / 2)``            ``{``                ``return` `true``;``            ``}``        ``}` `        ``return` `false``;``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main()``    ``{``        ``string` `str = ``"GeeksforGeeks"``;` `        ``if` `(checkHalfFrequency(str))``        ``{``            ``Console.WriteLine(``"Yes"``);``        ``}``        ``else``        ``{``            ``Console.WriteLine(``"No"``);``        ``}``    ``}``}` `/* This code contributed by Code_Mech */`

## PHP

 ` (int)(``\$L` `/ 2))``        ``{``            ``return` `true;``        ``}``    ``}` `    ``return` `false;``}` `// Driver code``\$str` `= ``"GeeksforGeeks"``;` `if` `(checkHalfFrequency(``\$str``))``{``    ``echo``(``"Yes"``);``}``else``{``    ``echo``(``"No"``);``}` `// This code is contributed by Code_Mech`

## Javascript

 ``
Output:
`No`

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