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- #include <iostream>
- using namespace std;
- int rek(int x) {
- if(x == 0) {
- return 0;
- }
- int cifra = x % 10;
- return rek(x / 10) + cifra;
- }
- int main() {
- int n;
- cin >> n;
- cout << rek(n) << endl;
- return 0;
- }
- /*
- rek(123) = rek(12) + 3 = 3 + 3 = 6
- rek(12) = rek(1) + 2 = 1 + 2 = 3
- rek(1) = rek(0) + 1 = 0 + 1 = 1
- rek(0) = 0
- **/
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