How to use an iterator to begin() and offset In C++
The iterator to the begin() is incremented until it reaches the offset using the while loop and then the key-value pair is printed.
C++
// C++ Program to Get// Map Element At Offset// using iterator to begin()// and offset#include <bits/stdc++.h>using namespace std;int main(){ // Declaring a map with char ,int map<char, int> m; // Adding pairs into the map m.insert({ 'a', 3 }); m.insert({ 'g', 2 }); m.insert({ 'f', 4 }); m.insert({ 'e', 5 }); m.insert({ 'd', 4 }); m.insert({ 'b', 3 }); int offset = 3; auto itr = m.begin(); int k = 0; // Iterate while k is <offset while (k < offset) { k++; itr++; } // print the key value pair at offset cout << itr->first << " " << itr->second << endl;} |
Output
e 5
Get Map Element at Offset in C++ STL
Prerequisites: Map in C++ STL
Since the map is not indexed as arrays or vectors sequential access is not possible in the map but to access an element at a particular offset.
Example:
inserted elements are { ‘a’,11 } , { ‘b’,12 } , { ‘ c ‘, 13 }
then we can get { ‘b’, 12 } for 2 position.
Methods to Get Map Element at Offset in C++ STL
- Using an iterator to begin() and offset
- Using advance() function
- Using the next() function