Dados dos vectores, únalos usando STL en C++.
Ejemplo:
Entrada:
vec1 = {1, 45, 54, 71, 76, 12},
vec2 = {1, 7, 5, 4, 6, 12}
Salida: {1, 4, 5, 6, 7, 12, 45, 54, 71, 76}
Entrada:
vec1 = {1, 7, 5, 4, 6, 12},
vec2 = {10, 12, 11}
Salida: {1, 4, 5, 6, 7, 10, 11, 12}
Enfoque: la unión se puede realizar con la ayuda de la función set_union() proporcionada en STL.
Sintaxis:
set_union (InputIterator1 first1, InputIterator1 last1,
InputIterator2 first2, InputIterator2 last2,
OutputIterator result);
CPP
// C++ program to join two Vectors
// using set_union() in STL
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Get the vector
vector<int> vector1 = { 1, 45, 54, 71, 76, 12 };
vector<int> vector2 = { 1, 7, 5, 4, 6, 12 };
// Sort the vector
sort(vector1.begin(), vector1.end());
sort(vector2.begin(), vector2.end());
// Print the vector
cout << "First Vector: ";
for (int i = 0; i < vector1.size(); i++)
cout << vector1[i] << " ";
cout << endl;
cout << "Second Vector: ";
for (int i = 0; i < vector2.size(); i++)
cout << vector2[i] << " ";
cout << endl;
// Initialise a vector
// to store the common values
// and an iterator
// to traverse this vector
vector<int> v(vector1.size() + vector2.size());
vector<int>::iterator it, st;
it = set_union(vector1.begin(),
vector1.end(),
vector2.begin(),
vector2.end(),
v.begin());
cout << "\nAfter joining:\n";
for (st = v.begin(); st != it; ++st)
cout << *st << ", ";
cout << '\n';
return 0;
}
Producción:
First Vector: 1 12 45 54 71 76 Second Vector: 1 4 5 6 7 12 After joining: 1, 4, 5, 6, 7, 12, 45, 54, 71, 76,
Tenga en cuenta que el vector no debe contener 1 elemento dos veces:
En caso de que ingrese los mismos elementos, la función set_union solo considerará 1 instancia del elemento y el resto predeterminado será 0.