How to use the advance() function In C++
One more way to access the element at any index is by using the advance() function. In this method, an iterator is given a value by which it should be advanced.
Syntax:
advance(it, n);
Here, it is the iterator pointing to the beginning of the set and n denotes the number of iterations. We can access the element by using *it.
Example:
C++
// C++ program to access // element by index in set. #include <bits/stdc++.h> using namespace std; int main() { set< int > s; // Inserting values in set s.insert(10); s.insert(20); s.insert(30); s.insert(40); s.insert(50); // Index int n=3; // Initializing iterator auto it = s.begin(); // Using advance function to // access nth index advance(it,n); // Printing the element at index n cout<<*it; return 0; } |
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How to Access Elements in Set by Index in C++?
Sets are the containers that are available in the C++ Standard Template Library (STL). They are used to hold distinct elements in a predetermined sequence; fundamentally, it operates on the same principles as a binary search tree.
In C++, elements can be added to or removed from sets, but they cannot be modified after being stored there since their values become constant. The following methods are available to access elements in a set by index in C++ STL:
- Accessing the element by iterating in the set.
- Accessing the element at a particular index using the next() function.
- Accessing the element at a particular index using the advance() function.
- By Creating Generic methods to access the nth element from any set
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