题解 | Digital Roots
Digital Roots
https://www.nowcoder.com/practice/cef727d0af33479c9fb4a9c120702414
#include <iostream>
using namespace std;
int main() {
int n;
while (cin >> n) {
cout << (n - 1) % 9 + 1 << endl;
}
return 0;
}
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