How to delete last element from a map in C++

Here we will see how to delete the last element from C++ STL map. The map is the hash table based data type, it has key and value. We can use the prev() method to get last element, and erase() function to delete as follows.

Example

 Live Demo

#include<iostream>
#include<map>
using namespace std;
int main() {
   map<string, int> my_map;
   my_map["first"] = 10;
   my_map["second"] = 20;
   my_map["third"] = 30;
   cout << "Map elements before deleting the last element:"<<endl;
   for (auto it = my_map.begin(); it != my_map.end(); it++)
      cout << it->first << " ==> " << it->second << endl;
   cout << "removing the last element from the map"<<endl;
   my_map.erase(prev(my_map.end()));
   cout << "Map elements after deleting the last element :"<<endl;
   for (auto it = my_map.begin(); it != my_map.end(); it++)
      cout << it->first << " ==> " << it->second << endl;
}

Output

Map elements before deleting the last element:
first ==> 10
second ==> 20
third ==> 30
removing the last element from the map
Map elements after deleting the last element :
first ==> 10
second ==> 20