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  1. #include <string>
  2. #include <numeric>
  3. #include <iostream>
  4. using namespace std;
  5.  
  6. int sum(string a) {
  7. 	if(a.size()==1) return a[0]-'0';
  8. 	else return sum(to_string(accumulate(a.begin(),a.end(),0,[](int acc,char l){return acc+=l-'0';})));
  9. }
  10.  
  11. int main(void) {
  12. 	string a;
  13. 	cin >> a;
  14. 	cout << sum(a);
  15. 	return 0;
  16. }
  17.  
Success #stdin #stdout 0s 3432KB
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stdin
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12345678901234567890
stdout
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9
https://ideone.com/iIHB0B
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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