unordered set Question 10

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Which option is correct for this program:

C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
    unordered_set<int> s = {1, 2, 3};
    auto it = s.begin();
    *it = 4;
}

Valid

Compilation error

Undefined behavior

Runtime error

This question is part of this quiz :

C++ Unordered Set

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GeeksforGeeks