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#include <iostream> int a(int n) { return n ? n + a(n - 1) : n; } int b(int n) { auto result{ 0 }; for (auto i{ 0 }; i <= n; ++i) result += i; return result; } int main() { std::cout << a(3) << std::endl; std::cout << b(3) << std::endl; return 0; }

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