Update

algorithm_interview_course/chapter_two/section_6.cpp

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+
+#include <iostream>
+#include <chrono>
+#include <thread>
+using namespace std;
+using namespace chrono;
+int fibonacci_2(int i) {
+       if(i <= 0) return 0;
+       if(i == 1) return 1;
+       return fibonacci_2(i - 1) + fibonacci_2(i - 2);
+}
+void time_consumption() {
+    int n;
+    while (cin >> n) {
+        milliseconds start_time = duration_cast<milliseconds >(
+            system_clock::now().time_since_epoch()
+        );
+
+        fibonacci_2(n);
+
+        milliseconds end_time = duration_cast<milliseconds >(
+            system_clock::now().time_since_epoch()
+        );
+        cout << milliseconds(end_time).count() - milliseconds(start_time).count() 
+            <<" ms"<< endl;
+    }
+}
+int main()
+{
+    time_consumption();
+    return 0;
+}
+