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#include <iostream> #include <vector> #include <queue> using namespace std; int rec(int x) { if(x == 0) { return 0; } int cifra = x % 10; return rec(x / 10) + cifra; } int main() { cout << rec(3456) << endl; return 0; } // rec(3456) = rec(345) + 6 = 12 + 6 = 18 // rec(345) = rec(34) + 5 = 7 + 5 = 12 // rec(34) = rec(3) + 4 = 3 + 4 = 7 // rec(3) = rec(0) + 3 = 0 + 3 = 3 // rec(0) = 0
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