How to check if a List contains all the elements of Another List in C++ - Step by Step Examples
How to check if a List contains all the elements of Another List in C++ ?
Answer
To check if a list contains all the elements of another list in C++, you can iterate over one list and check the presence of each element in the other list using nested loops.
✐ Examples
1 Check if List Contains All Elements of Another List (Positive Scenario)
In this example,
- We create two lists named
list1
andlist2
with different values. - We iterate over
list2
and check if each element is present inlist1
. - If all elements of
list2
are found inlist1
, we conclude thatlist1
contains all elements oflist2
. - Finally, we print the result to standard output.
C++ Program
#include <iostream>
#include <list>
int main() {
std::list<int> list1 = {1, 2, 3, 4, 5};
std::list<int> list2 = {2, 4};
bool result = true;
for (int num : list2) {
if (std::find(list1.begin(), list1.end(), num) == list1.end()) {
result = false;
break;
}
}
std::cout << "List 1 contains all elements of List 2: " << std::boolalpha << result << std::endl;
return 0;
}
Output
List 1 contains all elements of List 2: true
2 Check if List Contains All Elements of Another List (Negative Scenario)
In this example,
- We create two lists named
list1
andlist2
with different values. - We iterate over
list2
and check if each element is present inlist1
. - If any element of
list2
is not found inlist1
, we conclude thatlist1
does not contain all elements oflist2
. - Finally, we print the result to standard output.
C++ Program
#include <iostream>
#include <list>
int main() {
std::list<int> list1 = {1, 2, 3, 4, 5};
std::list<int> list2 = {2, 4, 6};
bool result = true;
for (int num : list2) {
if (std::find(list1.begin(), list1.end(), num) == list1.end()) {
result = false;
break;
}
}
std::cout << "List 1 contains all elements of List 2: " << std::boolalpha << result << std::endl;
return 0;
}
Output
List 1 contains all elements of List 2: false
Summary
In this tutorial, we learned How to check if a List contains all the elements of Another List in C++ language with well detailed examples.
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