From 3619685f031299c73a64c7c749c093003d2fa93b Mon Sep 17 00:00:00 2001
From: Gaurav Kumar Singh <84374316+gaurav-76@users.noreply.github.com>
Date: Sat, 28 Jan 2023 20:42:21 +0530
Subject: [PATCH 1/2] Implement API

New Amazon OA Question Implement API
---
 implementAPI.java | 43 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)
 create mode 100644 implementAPI.java

diff --git a/implementAPI.java b/implementAPI.java
new file mode 100644
index 0000000..dffb22e
--- /dev/null
+++ b/implementAPI.java
@@ -0,0 +1,43 @@
+public static List<String> implementAPI(List<String> logs) {
+
+    Map<String, Boolean> loggedIn = new HashMap<>();
+    Map<String, String> password = new HashMap<>();
+
+    List<String> res = new ArrayList<>();
+
+    for (String l : logs) {
+        String[] temp = l.split(" ");
+        if (temp[0].equals("register")) {
+            if (password.containsKey(temp[1]))
+                res.add("Username already exists");
+            else {
+                password.put(temp[1], temp[2]);
+                res.add("Registered Successfully");
+            }
+        } else if (temp[0].equals("login")) {
+            if (password.containsKey(temp[1]) && password.get(temp[1]).equals(temp[2])) {
+                if (loggedIn.containsKey(temp[1])) {
+                    if (loggedIn.get(temp[1]) == false) {
+                        loggedIn.put(temp[1], true);
+                        res.add("Logged In Successfully");
+                    } else {
+                        res.add("Login Unsuccessful");
+                    }
+                } else {
+                    loggedIn.put(temp[1], true);
+                    res.add("Logged In Successfully");
+                }
+            } else
+                res.add("Login Unsuccessful");
+        } else if (temp[0].equals("logout")) {
+            if (password.containsKey(temp[1]) && loggedIn.containsKey(temp[1]) && loggedIn.get(temp[1]) == true) {
+                loggedIn.put(temp[1], false);
+                res.add("Logged Out Successfully");
+            } else {
+                res.add("Logout Unsuccessful");
+            }
+        }
+    }
+
+    return res;
+}
\ No newline at end of file

From 7bdea44b475809be50934dfbdbb6fe8fa994488c Mon Sep 17 00:00:00 2001
From: Gaurav Kumar Singh <84374316+gaurav-76@users.noreply.github.com>
Date: Sat, 28 Jan 2023 20:50:33 +0530
Subject: [PATCH 2/2] Implement API cpp Code

New Amazon OA Question Implement API C++ Code
---
 implementAPI.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 implementAPI.cpp

diff --git a/implementAPI.cpp b/implementAPI.cpp
new file mode 100644
index 0000000..2fa56d3
--- /dev/null
+++ b/implementAPI.cpp
@@ -0,0 +1,47 @@
+vector<string> implementAPI(vector<string> &logs){
+vector<string> ans;
+map<string, pair<string, bool>> mp;
+for(string&s : logs){
+	vector<string> temp;
+	stringstream str(s);
+	string word;
+	while(str >> word){
+		temp.push_back(word);
+	}
+	string first = temp[0];
+	string user = temp[1];
+	if(first == "register"){
+		string pass = temp[2];
+		if(mp.find(user) != mp.end()){
+			ans.push_back("Username already exists");
+		}
+		else{
+			mp[user] = {pass, false};
+			ans.push_back("Registered Successfully");
+		}
+	}
+	else if(first == "login"){
+		string pass = temp[2];
+		if(mp.find(user) == mp.end()){
+			ans.push_back("Login Unsuccessful");
+		}
+		else if(mp[user].first != pass || mp[user].second == true){
+			ans.push_back("Login Unsuccessful");
+		}
+		else if(mp[user].first == pass){
+			ans.push_back("Logged In Successfully");
+			mp[user].second = true;
+		}
+	}
+	else if(first == "logout"){
+		if(mp.find(user) == mp.end() || mp[user].second == false){
+			ans.push_back("Logout Unsuccessful");
+		}
+		else{
+			ans.push_back("Logged Out Successfully");
+			mp[user].second = false;
+		}
+	}
+}
+return ans;
+}
\ No newline at end of file