102B - Sum of Digits - CodeForces Solution

#include <iostream>
#include <queue>

using namespace std;
int sumOfDigits(int x) {
    int sum = 0;
    while (x > 0) {
        sum += x % 10;
        x /= 10;
    }
    return sum;
}
int sumOfDigitsString(string x) {
    int sum = 0;
    int len = x.length();
    for (int i = 0; i < len; ++i) {
        sum += x[i] - '0';
    }
    return sum;
}
void solve () {
    string x;
    cin >> x;
    if (x.length() < 2) {
        cout << 0;
        return;
    }
    int newX = sumOfDigitsString(x);
    int counter = 1;
    while ( newX > 9 ) {
        newX = sumOfDigits(newX);
        ++counter;
    }
    cout << counter;
}
int main() {
    solve();
    return 0;
}