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C Program to Solve Two Sum Using Brute Force (With Algorithm & Output)

 Introduction The Two Sum problem is a popular coding interview question where we must find two indices of an array whose values add up to a given target. This program demonstrates a simple brute-force solution in C using nested loops and dynamic memory allocation. Problem Statement Given an integer array and a target value, return the indices of the two numbers such that they add up to the target. Each input has exactly one solution, and the same element cannot be used twice. The result should return the indices, not the values. If no solution exists, return NULL.  Algorithm / Logic Explanation Start the program. Traverse the array using a loop from index 0 to numsSize - 1 . Inside this loop, use another loop starting from i + 1 to numsSize - 1 . For every pair (i, j) , check if nums[i] + nums[j] == target . If condition becomes true: Allocate memory for 2 integers using malloc() . Store indices i and j . Set returnSize = 2 . Return the result poi...
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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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