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Quickly check if two STL vectors contain same elements or not

  • Difficulty Level : Basic
  • Last Updated : 16 Jul, 2021

Unlike normal C/C++ arrays, we don’t need to do element by element comparison to find if two given vectors contain same elements or not.
In case of vectors, the operator “==” is overloaded to find the result quickly. Below is an example to demonstrate same.
 

C++14




// C++ implementation to check whether elements
// in vector is equal or not
#include<bits/stdc++.h>
using namespace std;
 
// Check if all elements is equal or not
int main()
{
  // Comparing equal vectors
  vector<int> v1{3, 1, 2, 3};
  vector<int> v2{3, 1, 2, 3};
  (v1 == v2)?  cout << "Equal\n" : cout << "Not Equal\n";
   
  // Comparing non-equal vectors
  vector<int> v3{1, 2, 3, 4};
  (v1 == v3)?  cout << "Equal\n" : cout << "Not Equal\n";
   
  // comparing with empty
  vector<int> v4;
  (v1 == v4)?  cout << "Equal\n" : cout << "Not Equal\n";
 
  // comparing two empty
  vector<int> v5;
  (v5 == v4)?  cout << "Equal\n" : cout << "Not Equal\n";
 
   return 0;
}

Output: 

Equal
Not Equal
Not Equal
Equal

This article is contributed by Sachin Bisht. If you like GeeksforGeeks and would like to contribute, you can also write an article using write.geeksforgeeks.org or mail your article to review-team@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.
 

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