ProgramGuruTo check if a vector contains all the items of another vector in C++, you can use the std::all_of algorithm combined with the std::find algorithm.
In this example,
#include <vector>, #include <algorithm>, and #include <iostream> for working with vectors, algorithms, and input/output streams.vec1 with a set of numerical values.vec2 with a different set of numerical values.std::all_of algorithm to check if all elements of vec2 are present in vec1. The std::all_of algorithm takes a range and a predicate. The range is defined by vec2.begin() and vec2.end(), and the predicate is a lambda function that checks if each element of vec2 is found in vec1 using the std::find algorithm.std::find algorithm searches for an element in vec1 and returns an iterator to the found element or vec1.end() if the element is not found.std::all_of algorithm returns true if the predicate is true for all elements in the range; otherwise, it returns false.std::cout.#include <vector>
#include <algorithm>
#include <iostream>
int main() {
std::vector<int> vec1 = {1, 2, 3, 4, 5};
std::vector<int> vec2 = {2, 3, 4};
bool result = std::all_of(vec2.begin(), vec2.end(), [&vec1](int item) {
return std::find(vec1.begin(), vec1.end(), item) != vec1.end();
});
std::cout << std::boolalpha << result << std::endl;
return 0;
}true
In this example,
#include <vector>, #include <algorithm>, and #include <iostream> for working with vectors, algorithms, and input/output streams.main_vec with a series of character strings.sub_vec with a subset of character strings.std::all_of algorithm to check if all elements of sub_vec are present in main_vec. The std::all_of algorithm takes a range and a predicate. The range is defined by sub_vec.begin() and sub_vec.end(), and the predicate is a lambda function that checks if each element of sub_vec is found in main_vec using the std::find algorithm.std::find algorithm searches for an element in main_vec and returns an iterator to the found element or main_vec.end() if the element is not found.std::all_of algorithm returns true if the predicate is true for all elements in the range; otherwise, it returns false.std::cout.#include <vector>
#include <algorithm>
#include <iostream>
int main() {
std::vector<std::string> main_vec = {"apple", "banana", "cherry", "date", "fig"};
std::vector<std::string> sub_vec = {"banana", "cherry", "date"};
bool result = std::all_of(sub_vec.begin(), sub_vec.end(), [&main_vec](const std::string& item) {
return std::find(main_vec.begin(), main_vec.end(), item) != main_vec.end();
});
std::cout << std::boolalpha << result << std::endl;
return 0;
}true
In this example,
#include <vector>, #include <algorithm>, and #include <iostream> for working with vectors, algorithms, and input/output streams.primary_vec with a list of mixed data types including numbers and strings.secondary_vec with some elements that are not present in primary_vec.std::all_of algorithm to check if all elements of secondary_vec are present in primary_vec. The std::all_of algorithm takes a range and a predicate. The range is defined by secondary_vec.begin() and secondary_vec.end(), and the predicate is a lambda function that checks if each element of secondary_vec is found in primary_vec using the std::find algorithm.std::find algorithm searches for an element in primary_vec and returns an iterator to the found element or primary_vec.end() if the element is not found.secondary_vec are in primary_vec, the std::all_of algorithm returns false.std::cout.#include <vector>
#include <algorithm>
#include <iostream>
int main() {
std::vector<std::variant<int, std::string>> primary_vec = {10, 20, 30, "apple", "banana"};
std::vector<std::variant<int, std::string>> secondary_vec = {20, "banana", "cherry"};
bool result = std::all_of(secondary_vec.begin(), secondary_vec.end(), [&primary_vec](const auto& item) {
return std::find(primary_vec.begin(), primary_vec.end(), item) != primary_vec.end();
});
std::cout << std::boolalpha << result << std::endl;
return 0;
}false
In this tutorial, we learned How to check if a Vector contains all the items of Another Vector in C++ language with well detailed examples.