lijunchen 2020-11-27 13:04:42 10 返回题目
#include using namespace std; int main() { long long t=1,d=0, i, o; cin >> o; if(o<=2)cout<<"1"; else { for (i = 1; i <= o-2; ++i){ d=t; t+=d; } cout << t; } return 0; }
