list, C++ (gcc) - rextester

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//Title of this code

#include <iostream>
#include <list>

using namespace std;

void printList(list<int>& l) {
    for (auto it = l.begin(); it != l.end(); ++it)
        cout << *it << " ";
    cout << endl;
}

int main()
{
    
    list<int> l1, l2, l3;
    
    
    l1.push_back(11); l1.push_back(2); l1.push_back(1); l1.push_back(12); l1.push_back(3);
    l2.push_back(6); l2.push_back(7); l2.push_back(9); l2.push_back(10); 
    
    l1.sort();
    l2.sort();
    
    printList(l1);
    printList(l2);
    
    
    auto p = l2.begin();
    for (auto it = l1.begin(); it != l1.end(); ++it) {
        if (*it > *p) {
            l1.splice(it, l2);
            break;
        }        
    }
    
    int x = 8;
    for (auto it = l1.begin(); it != l1.end(); ++it) {
        
        if (*it > x) {
            l1.insert(it, x);
            break;
        }
    }
    
    
    printList(l1);
    
    
    printList(l2);
    l2.merge(l1);
    printList(l2);
    
    
    std::cout << "Hello, world!\n";
}

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Compilation time: 0.4 sec, absolute running time: 0.04 sec, cpu time: 0 sec, memory peak: 3 Mb, absolute service time: 0.45 sec