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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 ...
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C Program for Referencing and Dereferencing (Pointers)

C Program for Referencing and Dereferencing (Pointers)

✅ C Program for Referencing and Dereferencing (Pointers)

#include<stdio.h>
int main()
{
    int x = 10;
    int *ptr = &x;   // Referencing = storing the address of variable 'x' into pointer 'ptr'.

    printf("%d", *ptr);  // Dereferencing = fetching the value stored at that address (here 10).
}

📘 Explanation:

Pointers in C are used to store the address of variables. - Referencing (&): The & operator is used to get the address of a variable. - Dereferencing (*): The * operator is used to fetch the value stored at that address.

In this program:

  • int *ptr = &x; → stores the address of x into pointer ptr.
  • *ptr → retrieves the value stored at that address (10).

🧾 Sample Output:

10

🔑 Keywords:

C pointers, referencing in C, dereferencing in C, pointer basics, beginner C programs, C interview questions on pointers

📌 Hashtags:

#CProgramming #Pointers #Referencing #Dereferencing #InterviewPrep

🔍 Search Description:

Simple C program to demonstrate referencing (&) and dereferencing (*) using pointers. Explains storing an address and accessing value with sample output.

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