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map rbegin() function in C++ STL
In this article we will be discussing the working, syntax and examples of map::rbegin() function in C++ STL.
What is a Map in C++ STL?
Maps are the associative container, which facilitates to store the elements formed by a combination of key value and mapped value in a specific order. In a map container the data is internally always sorted with the help of its associated keys. The values in the map container are accessed by its unique keys.
What is a map::rbegin()?
map::rbegin() function is an inbuilt function in C++ STL, which is defined in
Syntax
Map_name.rbegin();
Parameter
This function accepts no parameter.
Return value
This function returns the iterator which is pointing to the last element of the map container.
Example
Input
map<char, int> newmap; newmap[‘a’] = 1; newmap[‘b’] = 2; newmap[‘c’] = 3; newmap.rbegin();
Output
c:3
Example
#include <bits/stdc++.h>
using namespace std;
int main() {
map<int, int> TP_Map;
TP_Map.insert({3, 50});
TP_Map.insert({2, 30});
TP_Map.insert({1, 10});
TP_Map.insert({4, 70});
//using map::rbegin to fetch first last element
auto temp = TP_Map.rbegin();
cout<<"First element is: "<<temp->first << " -> " << temp->second;
cout<<"\nTP Map is : \n";
cout << "MAP_KEY\tMAP_ELEMENT\n";
for (auto i = TP_Map.rbegin(); i!= TP_Map.rend(); i++) {
cout << i->first << "\t" << i->second << endl;
}
return 0;
}Output
First element is: 4 -> 70 TP Map is: MAP_KEY MAP_ELEMENT 4 70 3 50 2 30 1 10
Updated on: 15-Apr-2020
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