std::weak_ptr and Circular Reference Prevention

Medium Smart Pointers

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Problem Statement

Write a C++ program using `std::weak_ptr` to observe a resource managed by `std::shared_ptr` without increasing its reference count.

Input Format

A single integer N.

Output Format

Print reference count before locking weak pointer, and accessed value after locking.

Constraints

-100000 <= N <= 100000

Sample Input

Sample Output

Use Count: 1, Weak Value: 77

Explanation

`std::weak_ptr` prevents cyclic reference leaks in shared pointer graphs by not contributing to reference counts.

Starter Code

#include <iostream>
#include <memory>

int main() {
    int n;
    if (std::cin >> n) {
        // Write your weak_ptr lock logic here
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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