learned math

Author: JabedWeb

B_Sum_of_Digits.cpp

@@ -0,0 +1,33 @@
+////https://codeforces.com/contest/102/problem/B
+#include <bits/stdc++.h>
+using namespace std;
+typedef long long ll;
+const int mod = 1e9 + 7;
+const int N = 1e5 + 5;
+
+void solve()
+{
+    string s;
+    cin >> s;
+    int count = 0;
+
+    while (s.size() > 1)
+    {
+        ll sum = 0;
+        for (char c : s)
+        {
+            sum += c - '0';
+        }
+        count++;
+
+        s = to_string(sum);
+    }
+    cout << count << endl;
+}
+
+int main()
+{
+    ios_base::sync_with_stdio(0);
+    cin.tie(0);
+    solve();
+}