Array References

Medium References

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Problem Statement

Write a C++ program defining a function that takes a reference to an array (`int (&arr)[N]`) and doubles its elements.

Input Format

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

Output Format

Print doubled array elements separated by a space.

Constraints

1 <= N <= 10

Sample Input

4
1 2 3 4

Sample Output

2 4 6 8

Explanation

C++ allows passing exact-sized array references without decaying to raw pointers.

Starter Code

#include <iostream>

template <size_t N>
void doubleArray(int (&arr)[N]) {
    for (size_t i = 0; i < N; i++) arr[i] *= 2;
}

int main() {
    int n;
    if (std::cin >> n) {
        int arr[10];
        for (int i = 0; i < n; i++) std::cin >> arr[i];
        doubleArray(arr);
        for (int i = 0; i < n; i++) {
            std::cout << arr[i];
            if (i < n - 1) std::cout << " ";
        }
        std::cout << "n";
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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