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using namespace std; int f(int x) { if(x == 0) { return 0; } return f(x / 10) + (x % 10); } int main() { cout << f(1234) << endl; return 0; } /* f(1234) --> f(123) + 4 = 6 + 4 = 10 f(123) --> f(12) + 3 = 3 + 3 = 6 f(12) --> f(1) + 2 = 1 + 2 = 3 f(1) --> f(0) + 1 = 0 + 1 = 1 f(0) = 0 */
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