CPP

c++ string contains

if (string1.find(string2) != std::string::npos) {
    std::cout << "found!" << '
';
}

c++ contains

if (s1.find(s2) != std::string::npos) {
    std::cout << "found!" << '
';
}

includes c++

#include <bits/stdc++.h>
using namespace std;
int main()
{
    vector<int> v1 ={1,2,3,4,5};
    vector<int> v2 ={1,4};
    cout<<includes(v1.begin(),v1.end(),v2.begin(),v2.end());
    return 0;
}