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  1. #include <bits/stdc++.h>
  2. #include <thread>
  3. #include <mutex>
  4. using namespace std;
  5. mutex vote_lock;
  6. condition_variable cv;
  7. int turn=0;
  8. class Poll{
  9. public:
  10.     string PollId;
  11.     string question;
  12.     vector<string>options;
  13.     map<string,vector<pair<string,string>>>votes;
  14.     map<string,int>results;
  15.     Poll(string PollId,string question,vector<string>options){
  16.         this->PollId=PollId;
  17.         this->question=question;
  18.         this->options=options;
  19.         votes.clear();
  20.         results.clear();
  21.     }
  22.     Poll()=default;
  23. };
  24. unordered_map<string,Poll>polls;
  25. void createPoll(string question, vector<string>options){
  26.     int sz = polls.size()+1;
  27.     string pollId = "poll"+to_string(sz);
  28.     Poll poll = Poll(pollId,question,options);
  29.     polls[pollId]=poll;
  30.     cout<<"Poll created successfully"<<'\n';
  31. }
  32. void updatePoll(string pollId, string question, vector<string>options){
  33.     Poll *poll = &polls[pollId];
  34.     (*poll).options=options;
  35.     (*poll).question=question;
  36.     cout<<"Poll updates successfully"<<'\n';
  37. }
  38. void deletePoll(string pollId){
  39.     polls.erase(pollId);
  40. }
  41. void voteInPoll(string pollId, string userId, string option){
  42.     lock_guard<mutex>lock(vote_lock);
  43.     Poll *poll = &polls[pollId];
  44.     (*poll).votes[option].push_back({userId,option});
  45.     string optionIndex = "";
  46.     optionIndex +=option[6];
  47.     // cout<<"hi "<<optionIndex<<'\n';
  48.     string val = (*poll).options[stoi(optionIndex)-1];
  49.     cout<<val<<'\n';
  50.     (*poll).results[val]++;
  51.     cout<<"Vote cast successfully"<<'\n';
  52.     turn++;
  53.     if(turn==3){
  54.     	cv.notify_all();
  55.     }
  56. }
  57. void viewPollResults(string pollId){
  58. 	unique_lock<mutex> lock(vote_lock);
  59. 	while(turn!=3){
  60. 		cv.wait(lock);
  61. 	}
  62.     Poll *poll = &polls[pollId];
  63.     cout<<"PollId: "<<(*poll).PollId<<'\n';
  64.     cout<<"Question: "<<(*poll).question<<'\n';
  65.     cout<<"Results: "<<'\n';
  66.     for(auto it:(*poll).options){
  67.         cout<<it<<": "<<(*poll).results[it]<<'\n';
  68.     }
  69.  
  70.  
  71. }
  72. int main(){
  73.     createPoll("What is your favorite color?", {"Red", "Blue", "Green", "Yellow"});
  74.     thread t1(voteInPoll,"poll1", "user1", "Option1");
  75.     thread t2(voteInPoll,"poll1", "user2", "Option2");
  76.     thread t3(voteInPoll,"poll1", "user3", "Option1");
  77.     viewPollResults("poll1");
  78.     t1.join();
  79.     t2.join();
  80.     t3.join();
  81.  
  82. }
Success #stdin #stdout 0.01s 5260KB
comments (?)
stdin 
Standard input is empty
stdout 
Poll created successfully
Red
Vote cast successfully
Blue
Vote cast successfully
Red
Vote cast successfully
PollId: poll1
Question: What is your favorite color?
Results: 
Red: 2
Blue: 1
Green: 0
Yellow: 0
https://ideone.com/K5VeS0
language:
C++ (gcc 8.3)
created:
85 days ago
visibility:
public

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