ajout compter les utilisateurs actifs et nouveaux par jour

src/main.cpp

@@ -1,33 +1,60 @@
 #include <iostream>
+#include <vector>
+#include <map>
 #include <set>
 #include <string>
 #include <chrono>
 
 #include "sqlite3pp.h"
 
-using namespace std;
-
 int main(int argc, char const *argv[])
 {
-  chrono::steady_clock::time_point begin = std::chrono::steady_clock::now();
+  auto begin = std::chrono::steady_clock::now();
 
   sqlite3pp::database db("../uwu2x.db");
+  sqlite3pp::query q(db, "SELECT DISTINCT identifier, strftime('%Y-%m-%d', date) FROM interaction ORDER BY date ASC;");
 
-  sqlite3pp::query qry(db, "SELECT identifier FROM interaction;");
+  std::vector<std::vector<std::string>> interactions;
 
-  set<string> identifiers;
-
-  for (auto v : qry) {
-    string identifier;
-    v.getter() >> identifier;
-    identifiers.insert(identifier);
+  for (auto r : q)
+  {
+    std::string identifier, date;
+    r.getter() >> identifier >> date;
+    interactions.emplace_back(std::vector<std::string>{identifier, date});
   }
 
-  cout << identifiers.size() << " users" << endl;
+  std::cout << interactions.size() << std::endl;
 
-  std::chrono::steady_clock::time_point end = std::chrono::steady_clock::now();
-  
-  cout << chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << "ms elasped" << endl;
+  std::set<std::string> identifiers;
+  std::map<std::string, std::map<std::string, int>> activity;
+
+  for (size_t i = 0; i < interactions.size(); ++i)
+  {
+    const std::string &identifier = interactions[i][0];
+    const std::string &date = interactions[i][1];
+
+    if (activity.find(date) == activity.end())
+    {
+      activity[date]["u"] = 0;
+      activity[date]["n"] = 0;
+    }
+
+    activity[date]["u"] += 1;
+    if (identifiers.find(identifier) == identifiers.end())
+    {
+      activity[date]["n"] += 1;
+      identifiers.insert(identifier);
+    }
+  }
+
+  for (const auto &[key, val] : activity)
+  {
+    std::cout << key << " : u=" << val.at("u") << " n=" << val.at("n") << std::endl;
+  }
+
+  auto end = std::chrono::steady_clock::now();
+
+  std::cout << std::chrono::duration_cast<std::chrono::milliseconds>(end - begin).count() << "ms elapsed" << std::endl;
 
   return 0;
 }