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Solve LeetCode 3 Longest Substring Without Repeating Characters in C++ using the sliding window

Longest Substring Without Repeating Characters in C++ LeetCode 3 · sliding window · last index array Table of Contents Problem Statement Approach Algorithm C++ Program Input Sample Output Output Explanation Dry Run Flow of Execution Time Complexity Space Complexity Applications Key Points Interview Questions Frequently Asked Questions Conclusion Problem Statement 3. Longest Substring Without Repeating Characters Given a string s , find the length of the longest substring that contains no repeating characters. A substring is a continuous part of the string, so "pwke" is a subsequence of "pwwkew" but not a substring. Approach We use a sliding window . The window is the part of the string between start and end , and we always keep it free of repeated characters. An array lastIndex of size 128 remembers the most recent position of every ASCII ...

Write a program to check whether character is Upper Case, Lower Case or Digit

 Description : 

You have to read a characer and check it is  upper case, lower case, digit or none.of.above.

Sample Execution : 

Test case 1 : 

Enter the character : A

The character is Upper Case.

Test case 2 :

Enter the character : 5

The character is Digit.

Test case 3 :

Enter the character : !

The character not an alphabet or digit.

PROGRAM:

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#include<stdio.h>

int main()

{

    char ch;

  printf("Enter a character or digit;");

    scanf("%c",&ch);

     if(ch>='A' && ch<='Z')

   { printf("%c The character is Upper Case",ch );}

    else if(ch>='a' && ch<='z')

  {

       printf("%c The character is Lower Case",ch);

   }

   else if (ch>='0' && ch<='9')

   {

       printf("The character is Digit.");

   }

   else

   {

       printf("The character  not an  alphabet or digit.");

   }

   }

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sampleoutput;Enter a character:A

sampleinput;The character is Upper case.



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