Modifying Elements via Iterators

Medium STL Iterators

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Problem Statement

Write a C++ program using mutable iterators to double the value of every element in a `std::vector`.

Input Format

First line: N. Second line: N space-separated integers.

Output Format

Print modified vector elements separated by a space.

Constraints

1 <= N <= 1000

Sample Input

4
1 2 3 4

Sample Output

2 4 6 8

Explanation

Dereferencing mutable iterators (`*it *= 2`) modifies elements in-place.

Starter Code

#include <iostream>
#include <vector>

int main() {
    int n;
    if (std::cin >> n) {
        std::vector<int> vec(n);
        for (int i = 0; i < n; i++) std::cin >> vec[i];
        
        // Write your iterator modification logic here

    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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