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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 ...

C Program to Find the Second Last Character of a String

Second Last Character of String in C (scanf) - No Newline Handling

✅ C Program to Find the Second Last Character of a String (Clean scanf Version)

#include <stdio.h>
#include <string.h>

int main() {
    char str[100];

    printf("Enter a string: ");
    scanf("%[^\n]", str);  // Reads until newline, no need to handle '\n'

    int len = strlen(str);

    if (len < 2) {
        printf("String is too short to have a second last character.\n");
    } else {
        printf("Second last character: %c\n", str[len - 2]);
    }

    return 0;
}
  

๐Ÿ“˜ Explanation:

This program reads a string from the user using scanf("%[^\n]"), which captures input until the newline character but does not include it in the string.

  • It directly uses strlen() to find the length of the input.
  • If the string has fewer than 2 characters, a warning is displayed.
  • Otherwise, str[len - 2] gives the second last character.
  • No need for additional newline removal logic in this version.

๐Ÿงพ Sample Output:

Enter a string: Hello World
Second last character: l

Enter a string: H
String is too short to have a second last character.
  

๐Ÿ”‘ Keywords:

scanf string C, second last character, strlen example, no newline handling, C string logic, interview question, clean code C

๐Ÿ“Œ Hashtags:

#CProgramming #StringIndexing #strlen #scanfInput #InterviewCode #BeginnerFriendly

๐Ÿ” Search Description:

Clean and efficient C program to find the second last character in a string using scanf without newline handling. Simple logic using strlen. Great for C beginners.

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