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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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Student Structure Program in C

Student Structure Program in C

✅ Student Details using Structure in C

#include <stdio.h>

struct student {
    char name[20];
    int roll;
    float marks;
};

int main() {
    struct student s;

    printf("=== ENTER STUDENT DETAILS ===\n");
    printf("Enter the name of the student:\n");
    scanf(" %[^\n]", s.name);  // Accepts spaces

    printf("Roll Number of the student:\n");
    scanf("%d", &s.roll);

    printf("Enter marks of the student:\n");
    scanf("%f", &s.marks);

    printf("\n=== STUDENT DETAILS ===\n");
    printf("Name: %s\n", s.name);
    printf("Roll Number: %d\n", s.roll);
    printf("Marks: %.2f\n", s.marks);

    return 0;
}

📘 Explanation:

This C program uses a structure to store and print details of a student. The structure contains three members: name (string), roll (integer), and marks (float). The program takes input using scanf, including a method to accept strings with spaces, and then displays the data using printf. This example introduces basic use of structures, string input handling, and formatted output.

🧾 Sample Output:

=== ENTER STUDENT DETAILS ===
Enter the name of the student:
John Doe
Roll Number of the student:
101
Enter marks of the student:
87.5

=== STUDENT DETAILS ===
Name: John Doe
Roll Number: 101
Marks: 87.50

🔑 Keywords:

Structure in C, student data structure, scanf with spaces, display student info, C program using struct, formatted output, beginner C example

📌 Hashtags:

#CProgramming #StructuresInC #StudentDetails #BeginnerC #PrintfScanf #CProjects #LearnC

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