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# Maximum distinct lowercase alphabets between two uppercase

• Difficulty Level : Easy
• Last Updated : 11 May, 2021

Given a string containing alphabets in lowercase and uppercase, find the maximum count of distinct lowercase alphabets present between two uppercase alphabets.
Examples

```Input : zACaAbbaazzC
Output : The maximum count = 3

Input : edxedxxxCQiIVmYEUtLi
Output : The maximum count = 1```

Method 1 (Using Character Count Array):

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• Declare an array of size 26 where each index of the array represents a character in the English alphabet
• Iterate the string over its complete length
• For each lowercase character, increment the index of the corresponding array by 1.
• For each uppercase character, iterate the array and count the number of positions having value greater than zero.
• If this count is greater than the maximum count, update the maximum counter, and initialize the array by 0.

Below is the implementation of the above method.

## C++

 `// CPP Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``#include ``using` `namespace` `std;` `#define MAX_CHAR 26` `// Function which computes the``// maximum number of distinct``// lowercase alphabets between``// two uppercase alphabets``int` `maxLower(string str)``{``    ``int` `n = str.length();` `    ``// Ignoring lowercase characters in the``    ``// beginning.``    ``int` `i = 0;``    ``for` `(; i < n; i++) {``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``) {``            ``i++;``            ``break``;``        ``}``    ``}` `    ``// We start from next of first capital letter``    ``// and traverse through remaining character.``    ``int` `maxCount = 0;``    ``int` `count[MAX_CHAR] = { 0 };``    ``for` `(; i < n; i++) {` `        ``// If character is in uppercase,``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``) {` `            ``// Count all distinct lower case``            ``// characters``            ``int` `currCount = 0;``            ``for` `(``int` `j = 0; j < MAX_CHAR; j++)``                ``if` `(count[j] > 0)``                    ``currCount++;` `            ``// Update maximum count``            ``maxCount = max(maxCount, currCount);` `            ``// Reset count array``            ``memset``(count, 0, ``sizeof``(count));``        ``}` `        ``// If character is in lowercase``        ``if` `(str[i] >= ``'a'` `&& str[i] <= ``'z'``)``            ``count[str[i] - ``'a'``]++;``    ``}` `    ``return` `maxCount;``}` `// Driver function``int` `main()``{``    ``string str = ``"zACaAbbaazzC"``;``    ``cout << maxLower(str);``    ``return` `0;``}`

## Java

 `// Java Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``import` `java.util.Arrays;` `class` `GFG``{` `    ``static` `final` `int` `MAX_CHAR = ``26``;` `    ``// Function which computes the``    ``// maximum number of distinct``    ``// lowercase alphabets between``    ``// two uppercase alphabets``    ``static` `int` `maxLower(String str)``    ``{``        ``int` `n = str.length();` `        ``// Ignoring lowercase characters in the``        ``// beginning.``        ``int` `i = ``0``;``        ``for` `(; i < n; i++)``        ``{``            ``if` `(str.charAt(i) >= ``'A'` `&& str.charAt(i) <= ``'Z'``)``            ``{``                ``i++;``                ``break``;``            ``}``        ``}` `        ``// We start from next of first capital letter``        ``// and traverse through remaining character.``        ``int` `maxCount = ``0``;``        ``int` `count[] = ``new` `int``[MAX_CHAR];``        ``for` `(; i < n; i++)``        ``{` `            ``// If character is in uppercase,``            ``if` `(str.charAt(i) >= ``'A'` `&& str.charAt(i) <= ``'Z'``)``            ``{` `                ``// Count all distinct lower case``                ``// characters``                ``int` `currCount = ``0``;``                ``for` `(``int` `j = ``0``; j < MAX_CHAR; j++)``                ``{``                    ``if` `(count[j] > ``0``)``                    ``{``                        ``currCount++;``                    ``}``                ``}` `                ``// Update maximum count``                ``maxCount = Math.max(maxCount, currCount);` `                ``// Reset count array``                ``Arrays.fill(count, ``0``);``            ``}` `            ``// If character is in lowercase``            ``if` `(str.charAt(i) >= ``'a'` `&& str.charAt(i) <= ``'z'``)``            ``{``                ``count[str.charAt(i) - ``'a'``]++;``            ``}``        ``}``        ``return` `maxCount;``    ``}` `    ``// Driver code``    ``public` `static` `void` `main(String[] args)``    ``{``        ``String str = ``"zACaAbbaazzC"``;``        ``System.out.println(maxLower(str));``    ``}``}` `// This code is contributed by Rajput-Ji`

## Python3

 `# Python3 Program to find maximum``# lowercase alphabets present``# between two uppercase alphabets` `MAX_CHAR ``=` `26` `# Function which computes the``# maximum number of distinct``# lowercase alphabets between``# two uppercase alphabets``def` `maxLower(``str``):``    ``n ``=` `len``(``str``)` `    ``# Ignoring lowercase characters``    ``# in the beginning.``    ``i ``=` `0``    ``for` `i ``in` `range``(n):``        ``if` `str``[i] >``=` `'A'` `and` `str``[i] <``=` `'Z'``:``            ``i ``+``=` `1``            ``break``            ` `    ``# We start from next of first capital``    ``# letter and traverse through``    ``# remaining character.``    ``maxCount ``=` `0``    ``count ``=` `[]``    ``for` `j ``in` `range``(MAX_CHAR):``        ``count.append(``0``)``        ` `    ``for` `j ``in` `range``(i, n):` `        ``# If character is in uppercase,``        ``if` `str``[j] >``=` `'A'` `and` `str``[j] <``=` `'Z'``:` `            ``# Count all distinct lower``            ``# case characters``            ``currCount ``=` `0``            ``for` `k ``in` `range``(MAX_CHAR):``                ``if` `count[k] > ``0``:``                    ``currCount ``+``=` `1` `            ``# Update maximum count``            ``maxCount ``=` `max``(maxCount, currCount)` `            ``# Reset count array``            ``for` `y ``in` `count:``                ``y ``=` `0``                ` `        ``# If character is in lowercase``        ``if` `str``[j] >``=` `'a'` `and` `str``[j] <``=` `'z'``:``            ``count[``ord``(``str``[j]) ``-` `ord``(``'a'``)] ``+``=` `1``            ` `    ``return` `maxCount` `# Driver function``str` `=` `"zACaAbbaazzC"``;``print``(maxLower(``str``))` `# This code is contributed by Upendra Bartwal`

## C#

 `// C# Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``using` `System;``using` `System.Collections.Generic;            ` `class` `GFG``{``    ``static` `int` `MAX_CHAR = 26;` `    ``// Function which computes the``    ``// maximum number of distinct``    ``// lowercase alphabets between``    ``// two uppercase alphabets``    ``static` `int` `maxLower(String str)``    ``{``        ``int` `n = str.Length;` `        ``// Ignoring lowercase characters in the``        ``// beginning.``        ``int` `i = 0;``        ``for` `(; i < n; i++)``        ``{``            ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``            ``{``                ``i++;``                ``break``;``            ``}``        ``}` `        ``// We start from next of first capital letter``        ``// and traverse through remaining character.``        ``int` `maxCount = 0;``        ``int` `[]count = ``new` `int``[MAX_CHAR];``        ``for` `(; i < n; i++)``        ``{` `            ``// If character is in uppercase,``            ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``            ``{` `                ``// Count all distinct lower case``                ``// characters``                ``int` `currCount = 0;``                ``for` `(``int` `j = 0; j < MAX_CHAR; j++)``                ``{``                    ``if` `(count[j] > 0)``                    ``{``                        ``currCount++;``                    ``}``                ``}` `                ``// Update maximum count``                ``maxCount = Math.Max(maxCount, currCount);` `                ``// Reset count array``                ``Array.Fill(count, 0);``            ``}` `            ``// If character is in lowercase``            ``if` `(str[i] >= ``'a'` `&& str[i] <= ``'z'``)``            ``{``                ``count[str[i] - ``'a'``]++;``            ``}``        ``}``        ``return` `maxCount;``    ``}` `    ``// Driver code``    ``public` `static` `void` `Main(String[] args)``    ``{``        ``String str = ``"zACaAbbaazzC"``;``        ``Console.WriteLine(maxLower(str));``    ``}``}` `// This code is contributed by PrinciRaj1992`

## PHP

 `= ``'A'` `&&``            ``\$str``[``\$i``] <= ``'Z'``)``        ``{``            ``\$i``++;``            ``break``;``        ``}``    ``}` `    ``// We start from next of first capital letter``    ``// and traverse through remaining character.``    ``\$maxCount` `= 0;``    ``\$count` `= ``array_fill``(0, ``\$MAX_CHAR``, NULL);``    ``for` `(; ``\$i` `< ``\$n``; ``\$i``++)``    ``{` `        ``// If character is in uppercase,``        ``if` `(``\$str``[``\$i``] >= ``'A'` `&& ``\$str``[``\$i``] <= ``'Z'``)``        ``{` `            ``// Count all distinct lower case``            ``// characters``            ``\$currCount` `= 0;``            ``for` `(``\$j` `= 0; ``\$j` `< ``\$MAX_CHAR``; ``\$j``++)``                ``if` `(``\$count``[``\$j``] > 0)``                    ``\$currCount``++;` `            ``// Update maximum count``            ``\$maxCount` `= max(``\$maxCount``, ``\$currCount``);` `            ``// Reset count array``            ``\$count` `= ``array_fill``(0, ``\$MAX_CHAR``, NULL);``        ``}` `        ``// If character is in lowercase``        ``if` `(``\$str``[``\$i``] >= ``'a'` `&& ``\$str``[``\$i``] <= ``'z'``)``            ``\$count``[ord(``\$str``[``\$i``]) - ord(``'a'``)]++;``    ``}` `    ``return` `\$maxCount``;``}` `// Driver Code``\$str` `= ``"zACaAbbaazzC"``;``echo` `maxLower(``\$str``);` `// This code is contributed by ita_c``?>`

## Javascript

 ``
Output:
`3`

Time Complexity: O(n).

Method 2 (Using Hash Table): In this method, we extensively use the C++ STL container unordered_set
Below is the implementation of the above method :

## C++

 `// CPP Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``#include ``using` `namespace` `std;` `// Function which computes the``// maximum number of distinct``// lowercase alphabets between``// two uppercase alphabets``int` `maxLower(string str)``{``    ``int` `n = str.length();` `    ``// Ignoring lowercase characters in the``    ``// beginning.``    ``int` `i = 0;``    ``for` `(; i < n; i++) {``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``) {``            ``i++;``            ``break``;``        ``}``    ``}` `    ``// We start from next of first capital letter``    ``// and traverse through remaining character.``    ``int` `maxCount = 0;``    ``unordered_set<``int``> s;``    ``for` `(; i < n; i++) {` `        ``// If character is in uppercase,``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``) {` `            ``// Update maximum count if lowercase``            ``// character before this is more.``            ``maxCount = max(maxCount, (``int``)s.size());` `            ``// clear the set``            ``s.clear();``        ``}` `        ``// If character is in lowercase``        ``if` `(str[i] >= ``'a'` `&& str[i] <= ``'z'``)``            ``s.insert(str[i]);``    ``}` `    ``return` `maxCount;``}` `// Driver function``int` `main()``{``    ``string str = ``"zACaAbbaazzC"``;``    ``cout << maxLower(str);``    ``return` `0;``}`

## Java

 `// Java Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``import` `java.util.*;` `class` `GFG``{` `// Function which computes the``// maximum number of distinct``// lowercase alphabets between``// two uppercase alphabets``static` `int` `maxLower(``char``[] str)``{``    ``int` `n = str.length;` `    ``// Ignoring lowercase characters in the``    ``// beginning.``    ``int` `i = ``0``;``    ``for` `(; i < n; i++)``    ``{``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``        ``{``            ``i++;``            ``break``;``        ``}``    ``}` `    ``// We start from next of first capital letter``    ``// and traverse through remaining character.``    ``int` `maxCount = ``0``;``    ``HashSet s = ``new` `HashSet();``    ``for` `(; i < n; i++)``    ``{` `        ``// If character is in uppercase,``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``        ``{` `            ``// Update maximum count if lowercase``            ``// character before this is more.``            ``maxCount = Math.max(maxCount, (``int``)s.size());` `            ``// clear the set``            ``s.clear();``        ``}` `        ``// If character is in lowercase``        ``if` `(str[i] >= ``'a'` `&& str[i] <= ``'z'``)``            ``s.add((``int``)str[i]);``    ``}` `    ``return` `maxCount;``}` `// Driver Code``public` `static` `void` `main(String args[])``{``    ``String str = ``"zACaAbbaazzC"``;``    ``System.out.println(maxLower(str.toCharArray()));``}``}` `// This code is contributed by PrinciRaj1992`

## Python3

 `# Python3 Program to find maximum``# lowercase alphabets present``# between two uppercase alphabets` `# Function which computes the``# maximum number of distinct``# lowercase alphabets between``# two uppercase alphabets``def` `maxLower(``str``):``  ` `    ``n ``=` `len``(``str``);` `    ``# Ignoring lowercase characters``    ``# in the beginning.``    ``i ``=` `0``;``    ``for` `i ``in` `range``(n):``      ` `        ``if` `(``str``[i] >``=` `'A'` `and``            ``str``[i] <``=` `'Z'``):``            ``i ``+``=` `1``;``            ``break``;` `    ``# We start from next of first``    ``# capital letter and traverse``    ``# through remaining character.``    ``maxCount ``=` `3``;``    ``s ``=` `set``()``    ` `    ``for` `i ``in` `range``(n):` `        ``# If character is in``        ``# uppercase,``        ``if` `(``str``[i] >``=` `'A'` `and``            ``str``[i] <``=` `'Z'``):``          ` `            ``# Update maximum count if``            ``# lowercase character before``            ``# this is more.``            ``maxCount ``=` `max``(maxCount,``                           ``len``(s));``            ` `            ``# clear the set``            ``s.clear();` `        ``# If character is in``        ``# lowercase``        ``if` `(``str``[i] >``=` `'a'` `and``            ``str``[i] <``=` `'z'``):``            ``s.add(``str``[i]);``            ``return` `maxCount;` `# Driver Code``if` `__name__ ``=``=` `'__main__'``:``  ` `    ``str` `=` `"zACaAbbaazzC"``;``    ``print``(maxLower(``str``));` `# This code is contributed by 29AjayKumar`

## C#

 `// C# Program to find maximum``// lowercase alphabets present``// between two uppercase alphabets``using` `System;``using` `System.Collections.Generic;` `class` `GFG``{` `// Function which computes the``// maximum number of distinct``// lowercase alphabets between``// two uppercase alphabets``static` `int` `maxLower(``char``[] str)``{``    ``int` `n = str.Length;` `    ``// Ignoring lowercase characters in the``    ``// beginning.``    ``int` `i = 0;``    ``for` `(; i < n; i++)``    ``{``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``        ``{``            ``i++;``            ``break``;``        ``}``    ``}` `    ``// We start from next of first capital letter``    ``// and traverse through remaining character.``    ``int` `maxCount = 0;``    ``HashSet<``int``> s = ``new` `HashSet<``int``>();``    ``for` `(; i < n; i++)``    ``{` `        ``// If character is in uppercase,``        ``if` `(str[i] >= ``'A'` `&& str[i] <= ``'Z'``)``        ``{` `            ``// Update maximum count if lowercase``            ``// character before this is more.``            ``maxCount = Math.Max(maxCount,``                           ``(``int``)s.Count);` `            ``// clear the set``            ``s.Clear();``        ``}` `        ``// If character is in lowercase``        ``if` `(str[i] >= ``'a'` `&& str[i] <= ``'z'``)``            ``s.Add((``int``)str[i]);``    ``}` `    ``return` `maxCount;``}` `// Driver Code``public` `static` `void` `Main(String []args)``{``    ``String str = ``"zACaAbbaazzC"``;``    ``Console.WriteLine(maxLower(str.ToCharArray()));``}``}` `// This code is contributed by Rajput-Ji`

## Javascript

 ``
Output:
`3`

Time complexity : 0(n)

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