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How to reverse a Vector using STL in C++?
• Difficulty Level : Basic
• Last Updated : 19 Mar, 2019

Given a vector, reverse this vector using STL in C++.

Example:

```Input: vec = {1, 45, 54, 71, 76, 12}
Output: {12, 76, 71, 54, 45, 1}

Input: vec = {1, 7, 5, 4, 6, 12}
Output: {12, 6, 4, 5, 7, 1}
```

Approach: Reversing can be done with the help of reverse() function provided in STL.

Syntax:

```reverse(start_index, last_index);
```
 `// C++ program to reverse Vector``// using reverse() in STL`` ` `#include ``using` `namespace` `std;`` ` `int` `main()``{`` ` `    ``// Get the vector``    ``vector<``int``> a = { 1, 45, 54, 71, 76, 12 };`` ` `    ``// Print the vector``    ``cout << ``"Vector: "``;``    ``for` `(``int` `i = 0; i < a.size(); i++)``        ``cout << a[i] << ``" "``;``    ``cout << endl;`` ` `    ``// Reverse the vector``    ``reverse(a.begin(), a.end());`` ` `    ``// Print the reversed vector``    ``cout << ``"Reversed Vector: "``;``    ``for` `(``int` `i = 0; i < a.size(); i++)``        ``cout << a[i] << ``" "``;``    ``cout << endl;`` ` `    ``return` `0;``}`
Output:
```Vector: 1 45 54 71 76 12
Reversed Vector: 12 76 71 54 45 1
```
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