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  1. #include <algorithm>
  2. #include <iostream>
  3. #include <map>
  4. #include <stdio.h>
  5. #include <stdlib.h>
  6. #include <vector>
  7.  
  8. double CalcEquivalentR(const std::vector<double> &R, unsigned sw) 
  9. {
  10. 	double ER = 0;
  11. 	for (unsigned i = 0; i < R.size(); ++i) 
  12. 	{
  13. 		if ((sw >> i) & 0x01) 
  14. 		{
  15. 			if (R[i] == 0.0) 
  16. 			{
  17. 				return 0.0;
  18. 			}
  19. 			else 
  20. 			{
  21. 				ER += 1.0 / R[i];
  22. 			}
  23. 		}
  24. 	}
  25. 	return 1.0/ER;
  26. }
  27.  
  28. void ShowEquivalentR(const std::vector<double> &R) 
  29. {
  30. 	std::map<double/*等效電阻*/, unsigned/*組合方式*/> ER;
  31. 	unsigned n = 1 << R.size();
  32. 	for (unsigned sw = 1; sw < n; ++sw) 
  33. 	{
  34. 		double er = CalcEquivalentR(R, sw);
  35. 		ER[er] = sw;
  36. 	}
  37.  
  38. 	for (std::map<double, unsigned>::iterator it = ER.begin(); it != ER.end(); ++it) 
  39. 	{
  40.  
  41. 		std::cout << "when turn on(";
  42. 		unsigned sw = it->second;
  43. 		for (unsigned i = 0; i < R.size(); ++i)
  44. 		{
  45. 			if ((sw >> i) & 0x01)
  46. 			{
  47. 				std::cout << R[i] << ",";
  48. 			}
  49. 		}
  50. 		std::cout << ") the equal R is  " << it->first << std::endl;
  51. 	}
  52. }
  53.  
  54. int main()
  55. {
  56. 	std::vector<double> R = {3.2,3.7,4.7,5.0}; // 修改 R
  57. 	ShowEquivalentR(R);
  58. }
Success #stdin #stdout 0s 3472KB
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when turn on(3.2,3.7,4.7,5,) the equal R is  1.00448
when turn on(3.2,3.7,4.7,) the equal R is  1.25701
when turn on(3.2,3.7,5,) the equal R is  1.27751
when turn on(3.2,4.7,5,) the equal R is  1.3788
when turn on(3.7,4.7,5,) the equal R is  1.46405
when turn on(3.2,3.7,) the equal R is  1.71594
when turn on(3.2,4.7,) the equal R is  1.9038
when turn on(3.2,5,) the equal R is  1.95122
when turn on(3.7,4.7,) the equal R is  2.07024
when turn on(3.7,5,) the equal R is  2.12644
when turn on(4.7,5,) the equal R is  2.42268
when turn on(3.2,) the equal R is  3.2
when turn on(3.7,) the equal R is  3.7
when turn on(4.7,) the equal R is  4.7
when turn on(5,) the equal R is  5
https://ideone.com/NeZ65z
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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