Nested Namespaces

Medium Namespaces

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Problem Statement

Write a C++ program defining nested namespaces (`Outer::Inner`) and accessing their functions.

Input Format

Two space-separated integers A and B.

Output Format

Print subtraction difference.

Constraints

-10000 <= A, B <= 10000

Sample Input

50 20

Sample Output

Explanation

Nested namespaces organize code hierarchically into sub-modules.

Starter Code

#include <iostream>

namespace Outer {
    namespace Inner {
        int subtract(int a, int b) {
            // Implement subtraction here
            return 0;
        }
    }
}

int main() {
    int a, b;
    if (std::cin >> a >> b) {
        std::cout << Outer::Inner::subtract(a, b) << "n";
    }
    return 0;
}

Limits

Time Limit: 1s
Memory Limit: 256MB

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