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30 lines
471 B
30 lines
471 B
#include <bits/stdc++.h>
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using namespace std;
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// 数根
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// 暴力法
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void func1(int n) {
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while (true) {
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int sum = 0;
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while (n) {
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sum += n % 10;
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n /= 10;
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}
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n = sum;
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if (n < 10) break;
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}
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cout << n << endl;
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}
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// 公式法
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void func2(int n) {
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cout << (n % 9 ? n % 9 : 9) << endl;
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}
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int main() {
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int n;
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cin >> n;
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func1(n);
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func2(n);
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return 0;
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} |