Update Dockerfile and .gitpod.yml, add timestamp to PairSum.java

.gitpod.Dockerfile

@@ -1,7 +1,17 @@
 # docker build -f .gitpod.Dockerfile .
 FROM gitpod/workspace-full
 
+USER root
 RUN bash -c "sudo install-packages mysql-client"
-RUN bash -c ". /home/gitpod/.sdkman/bin/sdkman-init.sh && sdk install java 22.1.0.r17-grl && sdk default java 22.1.0.r17-grl && gu install native-image && sdk install quarkus"
+
+USER gitpod
+RUN bash -c "brew install hurl"
+
+ARG JAVA_SDK="21.0.2-amzn"
+RUN bash -c ". /home/gitpod/.sdkman/bin/sdkman-init.sh \
+    && sdk install java $JAVA_SDK \
+    && sdk default java $JAVA_SDK \
+    && sdk install quarkus"
+
 RUN bash -c "curl 'https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip' -o 'awscliv2.zip' && unzip awscliv2.zip && sudo ./aws/install"
 RUN bash -c "npm install -g aws-cdk"

.gitpod.yml

@@ -2,5 +2,5 @@ image:
   file: .gitpod.Dockerfile
 
 tasks:
-  - init: ./mvnw install -DskipTests=true
+  - init: ./mvnw install -fn -B -ntp && java -version
     command: echo "Welcome to JavaInterviews on GitPod"

src/main/java/cloud/caravana/algo/pairsum/PairSum.java

@@ -2,8 +2,14 @@
 
 import static cloud.caravana.Util.*;
 
+import java.text.DateFormat;
+import java.text.SimpleDateFormat;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
 import java.util.Arrays;
+import java.util.Calendar;
 import java.util.HashSet;
+import java.util.Random;
 import java.util.function.BiFunction;
 import java.util.stream.IntStream;
 
@@ -75,4 +81,27 @@ public static Integer[] tunnelPairSum(Integer[] xs, Integer target) {
         var result = tunnelTwoNumberSum(_xs, target);
         return intsToIntegers(result);
     }
+
+    static final DateTimeFormatter df = DateTimeFormatter.ofPattern("HH:mm:ss.SSS");
+    public static void main(String[] args) {
+        var xs = new Random()
+        .ints(50_000_000, 0, 100000)
+            .boxed()
+            .toArray(Integer[]::new);
+        var target = 1337;
+        timestamp("Initial: ");        
+        var result = iterPairSum(xs, target);
+        System.out.println(Arrays.toString(result));
+        timestamp("Iterative: ");
+        result = memoPairSum(xs, target);
+        System.out.println(Arrays.toString(result));
+        timestamp("Memoized: ");
+        result = tunnelPairSum(xs, target);
+        System.out.println(Arrays.toString(result));
+        timestamp("Tunnel:");
+    }
+
+    private static void timestamp(String msg) {
+        System.out.println(msg + LocalDateTime.now().format(df));
+    }
 }