Compare

Containers support the comparison operators ==, !=, <, >, <=, >=. The comparison of two containers happens on the elements of the containers. If you compare associative containers, their key is compared. Unordered associative containers support only the comparison operator == and !=.

Comparison of a container

// containerComparison.cpp
...
#include <array>
#include <set>
#include <unordered_map>
#include <vector>
...
using namespace std;

vector<int> vec1{1, 2, 3, 4};
vector<int> vec2{1, 2, 3, 4};
cout << (vec1 == vec2) << endl;       // true

array<int, 4> arr1{1, 2, 3, 4};
array<int, 4> arr2{1, 2, 3, 4};
cout << (arr1 == arr2) << endl;       // true

set<int> set1{1, 2, 3, 4};
set<int> set2{4, 3, 2, 1};
cout << (set1 == set2) << endl;       // true

set<int> set3{1, 2, 3, 4, 5};
cout << (set1 < set3) << endl;        // true

set<int> set4...