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358B BY lydia_2020 @ 2020-03-20 22:21:38 IN Problem 1060
#include<stdio.h> #include<iostream> using namespace std; int main() { int n; while (cin >> n) { int fn3 = 0; if (n <= 0) { fn3 = 0; } else if (n <= 2) { fn3 = 1; } else { int fn1 = 1; int fn2 = 1; for (int i = 3; i <= n; i++) { fn3 = fn1 + fn2; fn1 = fn2; fn2 = fn3; } } cout << fn3 << endl; } return 0; }