Duplicate Removal

Medium Arrays PRO

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Problem Statement

Write a C++ program that reads an array of N integers and removes duplicates, printing the unique elements in their original relative order.

Input Format

First line: N. Second line: N space-separated integers.

Output Format

Print unique array elements separated by a space.

Constraints

1 <= N <= 1000

Sample Input

6
40 10 30 10 20 40

Sample Output

40 10 30 20

Explanation

Filters out duplicate elements while preserving original arrival order.

Starter Code

#include <iostream>
#include <vector>
#include <unordered_set>

int main() {
    int n;
    if (std::cin >> n) {
        std::vector<int> arr(n);
        for (int i = 0; i < n; i++) std::cin >> arr[i];
        // Write your code here
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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