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#include <iostream> #include <vector> #include <algorithm> #include <fstream> #include <cmath> using namespace std; int rec(int number) { if(number == 0) { return 0; } return rec(number / 10) + (number % 10); } int main() { cout << rec(9145) << endl; return 0; } // rec(9145) = rec(914) + 5 = 14 + 5 = 19 // rec(914) = rec(91) + 4 = 10 + 4 = 14 // rec(91) = rec(9) + 1 = 9 + 1 = 10 // rec(9) = rec(0) + 9 = 0 + 9 = 9 // rec(0) = 0
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