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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 x * rec(x - 1); } int main() { cout << rec(5) << endl; return 0; } // rec(5) = 5 * rec(4) = 5 * 24 = 120 // rec(4) = 4 * rec(3) = 4 * 6 = 24 // rec(3) = 3 * rec(2) = 3 * 2 = 6 // rec(2) = 2 * rec(1) = 2 * 1 = 2 // rec(1) = 1
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