#include <iostream>
long long fibrTail(int n, long long a = 0, long long b = 1) {
if (n == 0) return a;
if (n == 1) return b;
return fibrTail(n - 1, b, a + b);
}
int main() {
int n = 50;
std::cout << "Fibonacci of " << n << " using tail recursion is " << fibrTail(n) << std::endl;
return 0;
}
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