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C++ Program to Merge Two Sorted Vectors

This C++ Program which combines two sorted arrays. The program uses two user-defined functions enter_elem( ) and comb( ). The function enter_elem( ) takes number of elements of the vector as the input and runs a for loop to push elements into the vector. The vectors are then sorted and passed into the function comb( ) which returns a combined vector. The elements of the combined vector are then output to the standard output stream.

Here is source code of the C++ program which combines two sorted arrays. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to Combine two Sorted Arrays

```
 */
```
```
 
```
```
#include<iostream>
```
```
#include<vector>
```
```
#include<algorithm>
```
```
using namespace std;
```
```
 
```
```
/* Function to input vector elements */
```
```
void enter_elem(vector<int>& a)
```
```
{
```
```
    int alen, val;
```

    cout << "Enter number of elements : ";

```
    cin >> alen;
```
```
 
```
```
    for (int i = 0; i < alen; i++)
```
```
    {
```
```
        cin >> val;
```
```
        a.push_back(val);
```
```
    }
```
```
}
```
```
 
```

/* Function to combine two integer vectors */

vector<int> comb(vector<int> a, vector<int> b)

```
{
```
```
    int alen = a.size();
```
```
    int blen = b.size();
```
```
    int tlen = alen + blen;
```
```
    vector<int> c(tlen);
```
```
    int i = 0, j = 0, k = 0;
```
```
 
```
```
    while (i < alen && j < blen)
```
```
    {
```
```
        if (a[i] < b[j])
```
```
            c[k++] = a[i++];
```
```
        else
```
```
            c[k++] = b[j++];
```
```
    }
```
```
    while (i < alen)
```
```
        c[k++] = a[i++];
```
```
 
```
```
    while (j < blen)
```
```
        c[k++] = b[j++];
```
```
 
```
```
    return c;
```
```
}
```
```
 
```
```
int main()
```
```
{ 
```
```
    vector<int> a;
```
```
    vector<int> b;
```
```
 
```

    cout << "Initialising vector A" << endl;

```
    enter_elem(a);
```
```
    sort(a.begin(), a.end());
```
```
 
```

    cout << "Initialising vector B" << endl;

```
    enter_elem(b);
```
```
    sort(b.begin(), b.end());
```
```
 
```
```
    vector<int> c = comb(a, b);
```
```
    for (int i = 0; i < c.size(); i++)
```
```
        cout << c[i] << "  ";
```
```
    cout << endl;
```
```
}
```

$ g++ main.cpp
$ ./a.out
Initialising vector A
Enter number of elements : 5
3 1 5 3 7
Initialising vector B
Enter number of elements : 3
8 5 10
1  3  3  5  5 7  8  10

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