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Merge Sort in C++

  Merge Sort in C++ Introduction Merge Sort is a popular sorting algorithm that follows the Divide and Conquer approach. It divides an array into smaller subarrays, recursively sorts those subarrays, and finally merges the sorted subarrays to produce a completely sorted array. In this tutorial, we will learn how to implement Merge Sort in C++ . The program divides the array into two halves using the mid index, recursively sorts both halves, and then combines them using the merge() function. Merge Sort has a time complexity of O(n log n) in the best, average, and worst cases. Table of Contents 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 Keywords Conclusion Algorithm Start the program. Read the size of the array. Read the array elements from the user. Call the mer...
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C Program to Remove Duplicate Characters from a String

🧹 C Program to Remove Duplicate Characters from a String

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

int main() {
    int i, j, k;
    char str[100];

    printf("Enter the string:\n");
    scanf(" %[^\n]", str);  // space before %[^\n] to handle newline

    for (i = 0; str[i] != '\0'; i++) {
        j = i + 1;
        while (str[j] != '\0') {
            if (str[j] == str[i]) {
                // Shift all characters one position to the left
                for (k = j; str[k] != '\0'; k++) {
                    str[k] = str[k + 1];
                }
                // Don't increment j here — next character is already shifted
            } else {
                j++;
            }
        }
    }

    printf("After removing Duplicate Elements in Given String: %s\n", str);
    return 0;
}

📝 Explanation:

This program reads a string from the user and removes duplicate characters by shifting the remaining characters left whenever a duplicate is found.

💡 Sample Output:

Enter the string:
programming
After removing Duplicate Elements in Given String: progamin

🔍 Keywords:

remove duplicates from string in C, string manipulation in C, C string interview programs, delete repeated characters, remove duplicate characters in C

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