题解 | #数字之和#

#include<cstdio>
int sum(int x) {
    int sum = x % 10;
    while (x % 10 != x) {
        x /= 10;
        sum += x % 10;
    }
    return sum;
}
int main() {
    int x;
    while (scanf("%d", &x) != EOF) {
        printf("%d ", sum(x));
        printf("%d\n", sum(x * x));
    }
    return 0;
}