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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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