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#include <iostream> #include <queue> #include <cmath> #include <vector> using namespace std; int rec(int x) { if(x <= 2) { return 1; } return rec(x - 1) + rec(x - 2); } int main() { cout << rec(5) << endl; return 0; } // rec(5) = rec(4) + rec(3) = 3 + 2 = 5 // rec(4) = rec(3) + rec(2) = 2 + 1 = 3 // rec(3) = rec(2) + rec(1) = 1 + 1 = 2 // rec(2) = 1 // rec(1) = 1 // rec(2) = 2 // rec(3) = rec(2) + rec(1) = 1 + 1 = 2 // rec(2) = 1 // rec(1) = 1
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