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  1. #include <bits/stdc++.h>
  2.  
  3. using namespace std;
  4.  
  5. string P;
  6.  
  7. int count_B;
  8.  
  9. int A,B;
  10.  
  11. int Bpos[5011];
  12.  
  13. int main() {
  14.  
  15. 	while (scanf("%d %d",&A,&B)!=EOF){
  16.  
  17. 		memset(Bpos,-1,sizeof(Bpos));
  18.  
  19. 		int idx=0;
  20. 		count_B=0;
  21. 		cin>> P;
  22.  
  23. 		for (int i=0;i<P.size();++i){
  24. 			if (P[i]=='B'){
  25. 				count_B++;
  26. 				Bpos[idx]=i;
  27. 				idx++;
  28. 			}
  29. 		}
  30. 		string aux;
  31. 		int minimo=0x3f3f3f3f;
  32. 		for (int i=0;i<=count_B;++i){
  33. 			int Arot=i;
  34.  
  35. 			int cata=idx-1;
  36.  
  37. 			int costo=0;
  38.  
  39. 			for (int j=0;j<count_B;++j){
  40.  
  41. 				if (P[j]=='B'){
  42. 					if (Bpos[cata]==j)
  43. 						cata--;
  44. 					if (cata<0) break;
  45. 				}
  46. 				else{
  47.  
  48. 					if (Arot){
  49. 						Arot--;
  50. 						costo+=A;
  51.  
  52. 						cata--;
  53. 					}else{
  54. 						costo+=((A-B)*( abs(Bpos[cata]-j ) ));
  55.  
  56.  
  57. 						cata--;
  58. 						if (cata<0) break;
  59. 					}
  60. 				}
  61.  
  62. 			}
  63.  
  64. 			minimo=min(minimo, costo);
  65.  
  66. 		}
  67.  
  68. 			printf("%d\n",minimo);
  69. 	}
  70.  
  71.  
  72.  
  73.  
  74. 	return 0;
  75. }
Success #stdin #stdout 0s 3360KB
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https://ideone.com/8ZTg3U
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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