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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 Records Using Structure Array in C

Student Records Using Structure Array in C

✅ Student Records Using Structure Array in C

#include <stdio.h>

struct student {
    char name[50];
    int roll;
    float marks;
};

int main() {
    int n;
    printf("Enter number of students: ");
    scanf("%d", &n);

    struct student s[n];  // Array of structs

    // Input Section
    for(int i = 0; i < n; i++) {
        printf("\n=== ENTER DETAILS OF STUDENT %d ===\n", i + 1);
        printf("Name: ");
        scanf(" %[^\n]", s[i].name);  // Accepts spaces

        printf("Roll Number: ");
        scanf("%d", &s[i].roll);

        printf("Marks: ");
        scanf("%f", &s[i].marks);
    }

    // Output Section
    printf("\n=== STUDENT DETAILS ===\n");
    for(int i = 0; i < n; i++) {
        printf("\nStudent %d\n", i + 1);
        printf("Name       : %s\n", s[i].name);
        printf("Roll Number: %d\n", s[i].roll);
        printf("Marks      : %.2f\n", s[i].marks);
    }

    return 0;
}

📘 Explanation:

This C program uses an array of structures to store details of multiple students. The structure student has fields for name, roll number, and marks. The program prompts the user for the number of students, then collects their data using a loop, and finally prints all the stored data. Useful in managing records in a structured format.

🧾 Sample Output:

Enter number of students: 2

=== ENTER DETAILS OF STUDENT 1 ===
Name: Naveen Kumar
Roll Number: 101
Marks: 85.5

=== ENTER DETAILS OF STUDENT 2 ===
Name: Ravi Teja
Roll Number: 102
Marks: 91

=== STUDENT DETAILS ===

Student 1
Name       : Naveen Kumar
Roll Number: 101
Marks      : 85.50

Student 2
Name       : Ravi Teja
Roll Number: 102
Marks      : 91.00

🔑 Keywords:

Structure Array in C, C Student Record Program, Array of Structures, Student Information Storage in C, struct keyword in C, C Programming for Beginners

📌 Hashtags:

#CProgramming #StructuresInC #StudentRecord #ArrayOfStructures #BeginnerCProgram #CollegeAssignment #LearnCProgramming

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