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Merge operations using STL in C++ | merge(), includes(), set_union(), set_intersection(), set_difference(), inplace_merge
In this tutorial, we will be discussing a program to understand the various merge operations using STL in C++.
The merge() function is used to merge two sorted containers in a way that the new container is also sorted. Further includes() is used to check if the elements from first container are present in the second one.
Example
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
int main(){
vector<int> v1 = {1, 3, 4, 5, 20, 30};
vector<int> v2 = {1, 5, 6, 7, 25, 30};
//initializing resultant vector
vector<int> v3(12);
merge(v1.begin(), v1.end(), v2.begin(),
v2.end(), v3.begin());
cout << "The new container after merging is :\n";
for (int &x : v3)
cout << x << " ";
cout << endl;
vector<int> v4 = {1, 3, 4, 5, 6, 20, 25, 30};
includes(v4.begin(), v4.end(), v1.begin(), v1.end())?
cout << "v4 includes v1":
cout << "v4 does'nt include v1";
return 0;
}Output
The new container after merging is : 1 1 3 4 5 5 6 7 20 25 30 30 v4 includes v1
Updated on: 14-Apr-2020
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