How to remove duplicate elements from a c++ Bidimensional array - c++

Question

When creating and duplicating the matrix, it writes it the way I want, my question is how can I eliminate the duplicate elements of matrix1 because I need it to only show me the values of the matrix without showing the duplicates. It would be more or less as follows.
enter number of rows: 3.
enter number of columns: 4.
Original Array:.
3 7 14 2.
6 2 3 15.
10 8 11 6.
Result Array:
3.
7.
14.
2.
6.
15.
10.
8.
11.
#include <iostream>
#include <ctime>
using namespace std;
int main()
{
int f = 0;
int c = 0;
cout<<"Ingresar numero de filas: ";
cin>>f;
cout<<"Ingresar numero de columnas: ";
cin>>c;
int matriz[f][c];
int matriz1[f][c];
srand(time(0));
for (int i = 0 ; i < f; i++ )
for (int j = 0 ; j < c ; j++ )
matriz[i][j] = 1 + rand()% 15;
cout<< "Arreglo Original"<< endl;
for (int i = 0 ; i < f; i++ ){
for (int j = 0 ; j < c ; j++ ){
cout<<matriz[i][j]<<" "; }
cout<< endl;
}
cout<< "Arreglo resultante "<<endl;
for (int i = 0 ; i < f; i++ ){
for (int j = 0 ; j < c ; j++ ){
matriz1[i][j] = matriz[i][j];
cout<< matriz1[i][j]<<endl;}
}
return 0;
}

Answer 1

Here you are:
#include <vector>
#include <memory>
#include <bitset>
#include <algorithm>
#include <iterator>
#include <iostream>
int main() {
std::vector<std::vector<int>> example{
{ 3, 7, 14, 2 },
{ 6, 2, 3, 15 },
{ 10, 8, 11, 6 }
};
int const max = 15; // while reading example find out max
auto is_avail = std::make_unique<std::bitset<max + 1>>();
std::vector<int> ans;
for (auto const& v : example) {
for (auto const e : v) {
if (!is_avail->test(e)) {
ans.emplace_back(e);
is_avail->set(e, true);
}
}
}
std::copy(ans.cbegin(), ans.cend(), std::ostream_iterator<int>(std::cout, "\n"));
return 0;
}
In case you want ans to be 2D too replace the code following the line
auto is_avail = std::make_unique<std::bitset<max + 1>>();
with
std::vector<std::vector<int>> ans{ example };
for (auto& v : ans) {
for (auto& e : v) {
if (!is_avail->test(e)) {
is_avail->set(e, true);
}
else {
e = -1; // error state
}
}
}
for (auto const& v : ans) {
for (auto const e : v) {
if (e != -1) {
std::cout << std::setw(2) << e;
}
else {
std::cout << std::setw(2) << ' ';
}
std::cout << '\t';
}
std::cout << '\n';
}
and don't forget to
#include <iomanip>
for std::setw.