斐波纳契数列！！

hobby!

[quote:3475dd7661="HOUSCOUS"][code:1]#include <iostream>
#include <vector>

using namespace std;

// Function f returns n'th Fibonacci number

unsigned int f(int x) {
    vector<unsigned int> fib(2);
    fib[0]=fib[1]=1;
    fib.reserve(x);
    while(x>=fib.size())
        fib.push_back(*(fib.end()-2) + *(fib.end()-1));
    return fib[x];
}

// Function f_print prints out n'th Fibonacci number

void f_print(int n) {
    cout << n << "th Fibonacci number is " << f(n) << endl;
}

// main is the entry point in C++

int main() {
    f_print(46);
    return 0;   
}

[/code:1][/quote]
请问我没有你include<iostream>库！