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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. class EventCounter
  5. {
  6. 	public:
  7. 	int expiry;
  8. 	deque<pair<string,long>> history;
  9. 	unordered_map<string,int> keyCount;
  10. 	EventCounter (int millis)
  11. 	{
  12. 		this->expiry = millis;
  13. 	}
  14.  
  15. 	void cleanup(long timestamp)
  16. 	{
  17. 		while(history.size()>0)
  18. 		{
  19. 			auto node = history.front();
  20. 			if(timestamp - node.second > expiry)
  21. 			{
  22. 				if(keyCount.count(node.first))
  23. 				{
  24. 					int cnt = keyCount[node.first];
  25. 					keyCount[node.first] = cnt-1;
  26. 					if(keyCount[node.first]==0)
  27. 					{
  28. 						keyCount.erase(node.first);
  29. 					}
  30. 				}
  31. 				history.pop_front();
  32. 			}
  33. 			else
  34. 			{
  35. 				break;
  36. 			}
  37. 		}
  38. 	}
  39.  
  40. 	void put(string element,long timestamp)
  41. 	{
  42. 		//cleanup(timestamp);
  43. 		history.push_back({element,timestamp});
  44. 		if(keyCount.count(element))
  45. 		{
  46. 			int existingcount = keyCount[element];
  47. 			keyCount[element] = existingcount +1;
  48. 		}
  49. 		else
  50. 		{
  51. 			keyCount[element]= 1;
  52. 		}
  53.  
  54. 	}
  55.  
  56. 	int getTotalCount(long timestamp)
  57. 	{
  58. 		cleanup(timestamp);
  59. 		return history.size();
  60. 	}
  61.  
  62. 	int getKeyCount(string element, long timestamp)
  63. 	{
  64. 		cleanup(timestamp);
  65. 			if(keyCount.count(element))
  66. 		{
  67. 			return keyCount[element];
  68. 		}
  69. 		else
  70. 		{
  71. 			return 0;
  72. 		}
  73. 	}
  74.  
  75. };
  76.  
  77. int main() {
  78. 	// your code goes here
  79. 	EventCounter counter(300*1000); // 300 second window
  80.  
  81.     // Simulation of events
  82.     counter.put("login", 1000);
  83.     counter.put("click", 2000);
  84.     counter.put("login", 3000);
  85.  
  86.     cout << "Login count at 3s: " << counter.getKeyCount("login", 3000) << endl;   // 2
  87.     cout << "Total events at 3s: " << counter.getTotalCount(3000) << endl;     // 3
  88.  
  89.     // Simulation of expiration: Jump to 301.5 seconds (301500 ms)
  90.     // The "login" at 1000ms expires.
  91.     cout << "Total events at 301.5s: " << counter.getTotalCount(301500) << endl; // 2
  92.  
  93.     return 0;
  94. 	return 0;
  95. }
Success #stdin #stdout 0s 5324KB
comments (?)
stdin
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Standard input is empty
stdout
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Login count at 3s: 2
Total events at 3s: 3
Total events at 301.5s: 2
https://ideone.com/JFvDeM
language:
C++ (gcc 8.3)
created:
15 hours ago
visibility:
public

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