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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 to Add Two Numbers Without '+' Operator

Binary Addition Without '+' in C

✅ C Program to Add Two Numbers Without '+' Operator

#include <stdio.h>

int main() {
    int a, b;
    printf("Enter two numbers:\n");
    scanf("%d %d", &a, &b);

    while (b != 0) {
        int carry = a & b;     // Calculate carry
        a = a ^ b;             // Add without carrying
        b = carry << 1;        // Shift carry to the left
    }

    printf("Sum is: %d\n", a);
    return 0;
}

📘 Explanation:

This program adds two numbers without using the + operator. It uses bitwise operations:

  • a ^ b calculates the sum without carry
  • a & b finds the carry
  • carry << 1 shifts the carry to the next bit
  • The loop continues until there’s no carry

🖥️ Sample Output:

Enter two numbers:
5 3
Sum is: 8

🔑 Keywords:

add without plus, bitwise sum, binary addition, C program without + operator, xor carry logic, beginner bitwise program

📌 Hashtags:

#CProgramming #BitwiseOperations #BinaryAddition #NoPlusOperator #XORLogic #BeginnerC

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