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  1. #include <iostream>
  2. #include <stdio.h>
  3. #include <string>
  4. #include <memory.h>
  5. using namespace std;
  6. typedef long long ll;
  7. class LuckySum{
  8. public:
  9. 	string s,res;
  10. 	bool dp[32][10][2][2];
  11. 	int v[3]={0,4,7};
  12. 	bool calc(int i,int h,bool s1,bool s2){
  13. 		if(i==s.size())
  14. 			return h==0 && s1 && s2;
  15. 		if(dp[i][h][s1][s2])
  16. 			return false;
  17. 		dp[i][h][s1][s2]=true;
  18. 		for(int d=!i;d<10;++d)
  19. 			for(int newH=0;newH<10;++newH){
  20. 				if(s[i]!='?' && s[i]-'0'!=d)
  21. 					continue;
  22. 				for(int a=s1;a<3;++a)
  23. 					for(int b=s2;b<3;++b){
  24. 						if((v[a]+v[b]+newH)/10!=h || (v[a]+v[b]+newH)%10!=d)
  25. 							continue;
  26. 						res+=d+'0';
  27. 						if(calc(i+1,newH,a>0,b>0))
  28. 							return true;
  29. 						res.resize(res.size()-1);
  30. 					}
  31. 			}
  32. 		return false;
  33. 	}
  34. 	long long construct(string note){
  35. 		s=note;
  36. 		memset(dp,0,sizeof(dp));
  37. 		res="";
  38. 		if(calc(0,0,0,0)){
  39. 			ll n;
  40. 			sscanf(&res[0],"%lld",&n);
  41. 			return n;
  42. 		}
  43. 		return -1;
  44. 	}
  45. };
  46. int main()
  47. {
  48. 	string s;
  49. 	cin>>s;
  50. 	LuckySum q;
  51. 	cout<<q.construct(s)<<endl;
  52. }
Success #stdin #stdout 0s 3420KB
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https://ideone.com/es58h3
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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