# Find the maximum element of a Vector using STL in C++

In this tutorial, we will be learning about how to find the maximum element of a vector using STL (Standard Template Library) in C++.

Basically, we just traverse the whole vector and check the greater element among them. But, traversing the whole vector takes a high amount of time. So, here we are reducing that by using an STL function.

Before moving into finding the maximum element of a vector. If you are a beginner, please go through the sample vector program of STL. So, that you will be comfortable with STL.

Take user input into vector in C++

### Description

By using the `*max_element()`

method from STL(Standard template library), we will be getting the maximum element of the vector.

### Header Files

We, generally require 3 Header files over here which are…

<iostream>(Standard input output stream)

<vector>(for declaring vector)

<algorithm>(in order to use *max_element() function)

### Syntax

*max_element(start_index,end_index)

Here…

- *max_element represents the name of a function.
- start_index represents the starting index of the vector.
- end_index represents the ending index of the vector.

### Time Complexity

O(n)

### Space Complexity

O(1)

The Auxiliary space is being considered.

### Code

The Sample code is as follows…

#include <iostream> #include<vector> #include<algorithm> using namespace std; int main() { int n; cout<<"Enter the size of a vector\n"; cin>>n; vector<int>v; cout<<"Enter the elements of the vector\n"; for(int i=0;i<n;i++) { int a; cin>>a; v.push_back(a); } cout<<"Maximum element is : "<<*max_element(v.begin(),v.end()); return 0; }

Output :

Enter the size of a vector 5 Enter the elements of the vector 1 3 6 8 3 Maximum element of the vector is : 8

**Explanation**

Here, firstly user enters the size of a vector. then the user enters the elements of the vector. then, by using the `*max_element()`

function it finds out the maximum element of the vector.

*max_element(v.begin(),v.end())

`v.begin()`

represents the starting index of the vector v.`v.end()`

represents the ending index of the vector v.

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