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Quiz: STL Containers

5 questionsNo time limitPass: 60%+10 XP on first pass

The containers every C++ programmer uses daily, with their costs: vector, pair, map and set, unordered_map, stack, queue, deque and priority_queue — with runnable examples.

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  1. Question 1

    Which container keeps keys in sorted order?

  2. Question 2

    What does this print?

    #include <iostream>
#include <set>
using namespace std;
int main() {
    set<int> s = {3, 1, 3, 2, 1};
    cout << s.size();
    return 0;
}
  3. Question 3

    By default, priority_queue<int> gives the:

  4. Question 4

    What is the average time to find a key in unordered_map?

  5. Question 5

    What does this print?

    #include <iostream>
#include <map>
using namespace std;
int main() {
    map<string, int> m;
    int x = m["missing"];
    cout << x << " " << m.size();
    return 0;
}