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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <vector>
  4. using namespace std;
  5.  
  6. int sum_digits(int a ) {
  7. 	int sum=0, count=0;
  8. 	while(a!=0)
  9. 	{
  10. 	    count++;
  11. 	    sum += a%10;
  12. 	    a /= 10;
  13. 	}
  14. 	return sum;
  15. }
  16.  
  17. struct Comparator {
  18. 	bool operator()(int a, int b) {
  19. 		int sum_digits_a = sum_digits(a);
  20. 		int sum_digits_b = sum_digits(b);
  21.  
  22. 		if(sum_digits_a == sum_digits_b)
  23. 			return a < b;
  24. 		return sum_digits_a < sum_digits_b;
  25. 	}
  26. };
  27.  
  28. int main() {
  29. 	vector<int> vec{13, 20, 7, 4};
  30.  
  31. 	sort(vec.begin(), vec.end(),Comparator() );
  32.  
  33. 	for(auto v : vec)
  34. 		cout << v << " ";
  35. 	return 0;
  36. }
  37.  
Success #stdin #stdout 0s 3416KB
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Standard input is empty
stdout
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20 4 13 7
https://ideone.com/oPbQ7S
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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