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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. int main(){
  4.     long long n;
  5.     cin>>n;
  6.     int count=0;
  7.     long long sum=0;
  8.     while(n>=10){
  9.        count++; //1 2 3
  10.        sum=0;
  11.        while(n>0){ //991 99 9  19 10
  12.        sum+=n%10; //1+9+9   9+1   0+1
  13.        n=n/10;   //99 9 0  1 0  1 0
  14.        }
  15.        n=sum;
  16.     }
  17.     cout<<count;
  18. }
Success #stdin #stdout 0s 5304KB
comments (?)
stdin 
Standard input is empty
stdout 
3
https://ideone.com/DkIAJG
language:
C++ (gcc 8.3)
created:
2 years ago
visibility:
public

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