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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	long long n; cin >> n;
  6. 	n = n*(n+1)/2;
  7.     stringstream ss;
  8.     ss << n;
  9.     string s;
  10.     ss >> s;
  11.     string res;
  12.     for(int i=(int)s.size() - 1; i>=0;){
  13.         for(int j=1; j<=3; j++){
  14.             res = s[i] + res;
  15.             i--;
  16.         }
  17.         if (i >= 0) res = ' ' + res;
  18.     }
  19.     cout << res << "\n" << s;
  20. }
  21.  
Success #stdin #stdout 0s 5328KB
comments (?)
stdin 
10
stdout 
55
55
https://ideone.com/dqB2pd
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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