How to check if Two Vectors have Same Items (Regardless of Order) in C++ - Step by Step Examples

How to check if Two Vectors have Same Items (Regardless of Order) in C++ ?

Answer

To check if two vectors have the same items regardless of order in C++, you can sort both vectors and then compare them.


✐ Examples

1 Check Equality of Numeric Vectors (Regardless of Order)

In this example,

  1. We create two vectors named vector1 and vector2.
  2. We sort both vectors using the std::sort algorithm from the algorithm header.
  3. We compare the sorted vectors using the == operator to check if they are equal.
  4. The == operator returns true if the vectors have the same items regardless of order, otherwise false.

C++ Program

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<int> vector1 = {3, 1, 2};
    std::vector<int> vector2 = {1, 2, 3};
    std::sort(vector1.begin(), vector1.end());
    std::sort(vector2.begin(), vector2.end());
    bool are_equal = vector1 == vector2;
    std::cout << std::boolalpha << are_equal;
    return 0;
}

Output

true

2 Check Equality of Character Vectors (Regardless of Order)

In this example,

  1. We create two vectors named vector1 and vector2.
  2. We sort both vectors using the std::sort algorithm from the algorithm header.
  3. We compare the sorted vectors using the == operator to check if they are equal.
  4. The == operator returns true if the vectors have the same items regardless of order, otherwise false.

C++ Program

#include <iostream>
#include <vector>
#include <algorithm>

int main() {
    std::vector<char> vector1 = {'b', 'c', 'a'};
    std::vector<char> vector2 = {'a', 'b', 'c'};
    std::sort(vector1.begin(), vector1.end());
    std::sort(vector2.begin(), vector2.end());
    bool are_equal = vector1 == vector2;
    std::cout << std::boolalpha << are_equal;
    return 0;
}

Output

true

Summary

In this tutorial, we learned How to check if Two Vectors have Same Items (Regardless of Order) in C++ language with well detailed examples.


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  28. How to create a Two Dimensional Vector in C++ ?
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  30. How to create a Three Dimensional Vector in C++ ?
  31. How to Copy a Vector in C++ ?
  32. How to Split a Vector in C++ ?
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  36. How to Append a Vector to another Vector in C++ ?
  37. How to Concatenate Two Vectors in C++ ?
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  39. How to check if Two Vectors have Same Items (Regardless of Order) in C++ ?
  40. How to Convert a Vector of Integers to a Vector of Strings in C++ ?
  41. How to Convert a Vector of Strings to a Vector of Integers in C++ ?
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