Sorting a vector in descending order in C++

Sorting a vector in C++ can be done by using std::sort(). It is defined in<algorithm> header. To get a stable sort std::stable_sort is used. It is exactly like sort() but maintain the relative order of equal elements. Quicksort(), mergesort() can also be used, as per requirement.

Sorting a vector in descending order can be done by using std::greater <>().

Algorithm

Begin
   Declare v of vector type.
      Initialize some values into v in array pattern.
   Print “Elements before sorting”.
   for (const auto &i: v)
      print all the values of variable i.
   Print “Elements after sorting”.
   Call sort(v.begin(), v.end(), greater <>()) function to sort all the
   elements in descending order of v vector.
   for (const auto &i: v)
      print all the values of variable i.
End.

This is a simple example of sorting a vector in C++:

Example

 Live Demo

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
int main() {
   vector<int> v = { 10, 9, 8, 6, 7, 2, 5, 1 };
   cout<<"Elements before sorting"<<endl;
   for (const auto &i: v)
      cout << i << ' '<<endl;
      cout<<"Elements after sorting"<<endl;
      sort(v.begin(), v.end(), greater <>());
   for (const auto &i: v)
      cout << i << ' '<<endl;
   return 0;
}

Output

Elements before sorting
10
9
8
6
7
2
5
1
Elements after sorting
10
9
8
7
6
5
2
1

Samual Sam

Updated on: 30-Jul-2019

17K+ Views

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