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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 Elements from an Array

🧹 C Program to Remove Duplicate Elements from an Array

#include<stdio.h>
int main( )
{
    int num;
    printf("Enter the size of the array:\n");
    scanf("%d",&num);
    if(num<=0)
    {
        printf("!invalid array size:\n");
        return 1;
    }
    int a[num];
    printf("Enter %d elements:\n",num);
    for(int i=0;i<num;i++)
    {
        scanf("%d",&a[i]);
    }
    for(int i=0;i<num;i++)
    {
        for(int j=i+1;j<num;)
        {
            if(a[i]==a[j])
            {
                for(int k=j;k<num-1;k++)
                {
                    a[k]=a[k+1];
                }
                num--;
            }
            else
            {
                j++;
            }
        }
    }
    printf("Ater Removing Duplicates from Array:\n");
    for(int i=0;i<num;i++)
    {
        printf("%d ",a[i]);
    }
}

📝 Explanation:

This program accepts an integer array from the user, removes all duplicate elements by shifting elements to the left, and prints the updated array without duplicates.

💡 Sample Output:

Enter the size of the array:
6
Enter 6 elements:
1 2 3 2 4 1
Ater Removing Duplicates from Array:
1 2 3 4

🔍 Keywords:

remove duplicates C program, array programs in C, delete duplicate values, array manipulation in C, beginner C exercise

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