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피보나치 수열
~cpp
#include<iostream>
using namespace std;
int abc(int x);
void main()
{
cout << "몇번째 숫자를 출력합니까?: " ;
int a;
cin >> a;
cout << abc(a);
}
int abc(int x)
{
return x<3 ? (x<2 ?1:2): abc(x-2) + abc(x-1);
}










