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  1. #include <iostream>
  2. #include <vector>
  3. using namespace std;
  4. int result = 0;
  5. void count2(int k, std::vector<int> d, int total, int temp, bool flag, unsigned short int pos, std::vector<std::string> s){
  6. 	//std::cout << temp << " ";
  7. 	if(pos==(d.size())){
  8. 		total+=temp;
  9. 		if(total==k){
  10. 			result++;
  11. 			for(unsigned short int i=0;i<d.size();i++){
  12. 				std::cout << s[i] << d[i];
  13. 			}
  14. 			std::cout << "=" << k <<"\n";
  15. 		}
  16. 		return;
  17. 	}
  18. 	s[pos]="+";
  19. 	count2(k,d,total+temp,+d[pos],true,pos+1,s);
  20. 	//put a - sign in pos
  21. 	s[pos]="-";
  22. 	count2(k,d,total+temp,-d[pos],false,pos+1,s);
  23. 	if(pos==0) return;
  24. 	//Append digit
  25. 	if(flag==true){
  26. 		s[pos]="";
  27. 		//std::cout << "<0 " << 10*temp-d[pos] << " ";
  28. 		count2(k,d,total,(10*temp-d[pos]),true,pos+1,s);
  29. 	}
  30. 	else{
  31. 		s[pos]="";
  32. 		//std::cout << ">0" << 10*temp+d[pos] << " ";
  33. 		count2(k,d,total,10*temp+d[pos],false,pos+1,s);
  34. 	}
  35.  
  36. }
  37. int main() {
  38. 	vector<int> a={1,2,3,3,3};
  39. 	vector<string> s;
  40. 	s.resize(a.size());
  41. 	// your code goes here
  42. 	count2(6,a,0,0,true,0,s);
  43. 	cout << result;
  44. 	return 0;
  45. }
Success #stdin #stdout 0s 3480KB
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stdin
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Standard input is empty
stdout
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+1+2+3+3-3=6
+1+2+3-3+3=6
+1+2-3+3+3=6
-1-2+3+3+3=6
4
https://ideone.com/p2tp5t
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
public

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