A  program to remove the duplicate numbers using vectors by the user using a C++ programming language. The program will work on C++ 11 version.

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Program Listing

#include <iostream>
#include <algorithm>
#include <vector>

int main()
	std::cout << "Remove duplicate numbers from vector in C++\n\n";
	std::cout << "How many numbers: ";
	int numberCount;
	std::cin >> numberCount;
	std::vector<int> numbers(numberCount);
	for (int i = 0; i < numberCount; ++i) {
        std::cout << "Give value in item no " << i+1 << " : ";
		std::cin >> numbers[i];
	std::sort(numbers.begin(), numbers.end());
	auto newEnd = std::unique(numbers.begin(), numbers.end());
	numbers.resize(std::distance(numbers.begin(), newEnd));
	std::cout <<"\n\n";
	std::cout << "List of numbers that are not duplicate:\n";
	for(int num : numbers) {
		std::cout << num << " ";