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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 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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