diff --git a/.gradle/7.1.1/executionHistory/executionHistory.bin b/.gradle/7.1.1/executionHistory/executionHistory.bin
new file mode 100644
index 0000000..b7c31cd
Binary files /dev/null and b/.gradle/7.1.1/executionHistory/executionHistory.bin differ
diff --git a/.gradle/7.1.1/executionHistory/executionHistory.lock b/.gradle/7.1.1/executionHistory/executionHistory.lock
index 195e100..32c0028 100644
Binary files a/.gradle/7.1.1/executionHistory/executionHistory.lock and b/.gradle/7.1.1/executionHistory/executionHistory.lock differ
diff --git a/.gradle/7.1.1/fileHashes/fileHashes.bin b/.gradle/7.1.1/fileHashes/fileHashes.bin
new file mode 100644
index 0000000..c340543
Binary files /dev/null and b/.gradle/7.1.1/fileHashes/fileHashes.bin differ
diff --git a/.gradle/7.1.1/fileHashes/fileHashes.lock b/.gradle/7.1.1/fileHashes/fileHashes.lock
index 0c72d4c..63ed858 100644
Binary files a/.gradle/7.1.1/fileHashes/fileHashes.lock and b/.gradle/7.1.1/fileHashes/fileHashes.lock differ
diff --git a/.gradle/buildOutputCleanup/buildOutputCleanup.lock b/.gradle/buildOutputCleanup/buildOutputCleanup.lock
index c593acb..ad9958d 100644
Binary files a/.gradle/buildOutputCleanup/buildOutputCleanup.lock and b/.gradle/buildOutputCleanup/buildOutputCleanup.lock differ
diff --git a/.gradle/buildOutputCleanup/outputFiles.bin b/.gradle/buildOutputCleanup/outputFiles.bin
new file mode 100644
index 0000000..ad06378
Binary files /dev/null and b/.gradle/buildOutputCleanup/outputFiles.bin differ
diff --git a/.idea/.gitignore b/.idea/.gitignore
new file mode 100644
index 0000000..26d3352
--- /dev/null
+++ b/.idea/.gitignore
@@ -0,0 +1,3 @@
+# Default ignored files
+/shelf/
+/workspace.xml
diff --git a/.idea/.name b/.idea/.name
new file mode 100644
index 0000000..8c4c5a2
--- /dev/null
+++ b/.idea/.name
@@ -0,0 +1 @@
+bootcamps-ejercicios
\ No newline at end of file
diff --git a/.idea/compiler.xml b/.idea/compiler.xml
new file mode 100644
index 0000000..659bf43
--- /dev/null
+++ b/.idea/compiler.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="CompilerConfiguration">
+    <bytecodeTargetLevel target="16" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
new file mode 100644
index 0000000..611e7c8
--- /dev/null
+++ b/.idea/gradle.xml
@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
+  <component name="GradleSettings">
+    <option name="linkedExternalProjectsSettings">
+      <GradleProjectSettings>
+        <option name="distributionType" value="DEFAULT_WRAPPED" />
+        <option name="externalProjectPath" value="$PROJECT_DIR$" />
+        <option name="modules">
+          <set>
+            <option value="$PROJECT_DIR$" />
+          </set>
+        </option>
+      </GradleProjectSettings>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/jarRepositories.xml b/.idea/jarRepositories.xml
new file mode 100644
index 0000000..fdc392f
--- /dev/null
+++ b/.idea/jarRepositories.xml
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="MavenRepo" />
+      <option name="name" value="MavenRepo" />
+      <option name="url" value="https://repo.maven.apache.org/maven2/" />
+    </remote-repository>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
new file mode 100644
index 0000000..e2cfc0f
--- /dev/null
+++ b/.idea/misc.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_16" project-jdk-name="corretto-16" project-jdk-type="JavaSDK" />
+</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations.xml b/.idea/runConfigurations.xml
new file mode 100644
index 0000000..797acea
--- /dev/null
+++ b/.idea/runConfigurations.xml
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RunConfigurationProducerService">
+    <option name="ignoredProducers">
+      <set>
+        <option value="com.android.tools.idea.compose.preview.runconfiguration.ComposePreviewRunConfigurationProducer" />
+      </set>
+    </option>
+  </component>
+</project>
\ No newline at end of file
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/build/classes/java/main/com/oracle/arrays/DynamicArrayList.class b/build/classes/java/main/com/oracle/arrays/DynamicArrayList.class
new file mode 100644
index 0000000..5214412
Binary files /dev/null and b/build/classes/java/main/com/oracle/arrays/DynamicArrayList.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/Multidimensional.class b/build/classes/java/main/com/oracle/arrays/Multidimensional.class
index d33c91f..8e08673 100644
Binary files a/build/classes/java/main/com/oracle/arrays/Multidimensional.class and b/build/classes/java/main/com/oracle/arrays/Multidimensional.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/Unidimensional.class b/build/classes/java/main/com/oracle/arrays/Unidimensional.class
index 2dbc08a..ca5d2c7 100644
Binary files a/build/classes/java/main/com/oracle/arrays/Unidimensional.class and b/build/classes/java/main/com/oracle/arrays/Unidimensional.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/impl/DynamicArrayListImpl.class b/build/classes/java/main/com/oracle/arrays/impl/DynamicArrayListImpl.class
new file mode 100644
index 0000000..5650152
Binary files /dev/null and b/build/classes/java/main/com/oracle/arrays/impl/DynamicArrayListImpl.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/impl/MultidimensionalImpl.class b/build/classes/java/main/com/oracle/arrays/impl/MultidimensionalImpl.class
index 40557a4..0de38db 100644
Binary files a/build/classes/java/main/com/oracle/arrays/impl/MultidimensionalImpl.class and b/build/classes/java/main/com/oracle/arrays/impl/MultidimensionalImpl.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/impl/UnidimensionalImpl.class b/build/classes/java/main/com/oracle/arrays/impl/UnidimensionalImpl.class
index 958eefe..18fe185 100644
Binary files a/build/classes/java/main/com/oracle/arrays/impl/UnidimensionalImpl.class and b/build/classes/java/main/com/oracle/arrays/impl/UnidimensionalImpl.class differ
diff --git a/build/classes/java/main/com/oracle/arrays/model/Posicion.class b/build/classes/java/main/com/oracle/arrays/model/Posicion.class
index 8bda835..9b362ce 100644
Binary files a/build/classes/java/main/com/oracle/arrays/model/Posicion.class and b/build/classes/java/main/com/oracle/arrays/model/Posicion.class differ
diff --git a/build/classes/java/main/com/oracle/dao/CityDao.class b/build/classes/java/main/com/oracle/dao/CityDao.class
new file mode 100644
index 0000000..967a753
Binary files /dev/null and b/build/classes/java/main/com/oracle/dao/CityDao.class differ
diff --git a/build/classes/java/main/com/oracle/dao/CountryDao.class b/build/classes/java/main/com/oracle/dao/CountryDao.class
new file mode 100644
index 0000000..5d0a1ea
Binary files /dev/null and b/build/classes/java/main/com/oracle/dao/CountryDao.class differ
diff --git a/build/classes/java/main/com/oracle/dao/InMemoryWorldDao.class b/build/classes/java/main/com/oracle/dao/InMemoryWorldDao.class
new file mode 100644
index 0000000..3d3fa49
Binary files /dev/null and b/build/classes/java/main/com/oracle/dao/InMemoryWorldDao.class differ
diff --git a/build/classes/java/main/com/oracle/dao/WorldDao.class b/build/classes/java/main/com/oracle/dao/WorldDao.class
new file mode 100644
index 0000000..488f7f0
Binary files /dev/null and b/build/classes/java/main/com/oracle/dao/WorldDao.class differ
diff --git a/build/classes/java/main/com/oracle/domain/City.class b/build/classes/java/main/com/oracle/domain/City.class
new file mode 100644
index 0000000..2ccb1d9
Binary files /dev/null and b/build/classes/java/main/com/oracle/domain/City.class differ
diff --git a/build/classes/java/main/com/oracle/domain/Country.class b/build/classes/java/main/com/oracle/domain/Country.class
new file mode 100644
index 0000000..ebc3e47
Binary files /dev/null and b/build/classes/java/main/com/oracle/domain/Country.class differ
diff --git a/build/classes/java/main/com/oracle/stream/CountriesAndCities.class b/build/classes/java/main/com/oracle/stream/CountriesAndCities.class
new file mode 100644
index 0000000..c37cc46
Binary files /dev/null and b/build/classes/java/main/com/oracle/stream/CountriesAndCities.class differ
diff --git a/build/classes/java/main/com/oracle/stream/Person.class b/build/classes/java/main/com/oracle/stream/Person.class
new file mode 100644
index 0000000..bbeb247
Binary files /dev/null and b/build/classes/java/main/com/oracle/stream/Person.class differ
diff --git a/build/classes/java/main/com/oracle/stream/StreamEjemplo.class b/build/classes/java/main/com/oracle/stream/StreamEjemplo.class
new file mode 100644
index 0000000..fe50ba3
Binary files /dev/null and b/build/classes/java/main/com/oracle/stream/StreamEjemplo.class differ
diff --git a/build/tmp/compileJava/previous-compilation-data.bin b/build/tmp/compileJava/previous-compilation-data.bin
index b09e7bb..fc770b5 100644
Binary files a/build/tmp/compileJava/previous-compilation-data.bin and b/build/tmp/compileJava/previous-compilation-data.bin differ
diff --git a/src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java b/src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java
index 6d304ab..b4ebbc5 100644
--- a/src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java
+++ b/src/main/java/com/oracle/arrays/impl/MultidimensionalImpl.java
@@ -6,11 +6,21 @@
 public class MultidimensionalImpl implements Multidimensional {
     @Override
     public Posicion getPosition(String[][] datos, String dato) {
+        for(int i=0;i< datos.length;i++){
+            int j=0;
+            while(j<datos[i].length){
+                if(datos[i][j].equals(dato)){
+                    return new Posicion(i,j);
+                }
+                j+=1;
+            }
+        }
         return null;
     }
 
     @Override
     public String getData(String[][] datos, Posicion posicion) {
-        return null;
+        return datos[posicion.getX()][posicion.getY()];
     }
 }
+
diff --git a/src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java b/src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java
index 927206e..2096d82 100644
--- a/src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java
+++ b/src/main/java/com/oracle/arrays/impl/UnidimensionalImpl.java
@@ -5,10 +5,36 @@
 public class UnidimensionalImpl implements Unidimensional {
     @Override
     public void ordenamiento(int[] arr) {
+        boolean flag=false;
+        while(!flag){
+            flag=true;
+            for(int i=0;i<arr.length-1;i++){
+                if(arr[i]>arr[i+1]){
+                    int a=arr[i];
+                    int b=arr[i+1];
+                    arr[i+1]=a;
+                    arr[i]=b;
+                    flag=false;
+                }
+            }
+        }
     }
 
     @Override
     public int[] ordenamientoReversa(int[] arr) {
-        return null;
+        boolean flag=false;
+        while(!flag){
+            flag=true;
+            for(int i=0;i<arr.length-1;i++){
+                if(arr[i]<arr[i+1]){
+                    int a=arr[i];
+                    int b=arr[i+1];
+                    arr[i+1]=a;
+                    arr[i]=b;
+                    flag=false;
+                }
+            }
+        }
+        return arr;
     }
 }
diff --git a/src/main/java/com/oracle/stream/CountriesAndCities.java b/src/main/java/com/oracle/stream/CountriesAndCities.java
index 37626e0..15c025b 100644
--- a/src/main/java/com/oracle/stream/CountriesAndCities.java
+++ b/src/main/java/com/oracle/stream/CountriesAndCities.java
@@ -3,6 +3,11 @@
 import com.oracle.dao.CityDao;
 import com.oracle.dao.CountryDao;
 import com.oracle.dao.InMemoryWorldDao;
+import com.oracle.domain.City;
+import com.oracle.domain.Country;
+
+import java.util.*;
+import java.util.stream.Collectors;
 
 public class CountriesAndCities {
     private static final CountryDao countryDao = InMemoryWorldDao.getInstance();
@@ -10,5 +15,7 @@ public class CountriesAndCities {
 
     public static void main(String[] args) {
         // Encontrar las ciudades mas pobladas en cada continente
+        Map<String, Optional<City>> ciudadesMasPobladas = cityDao.findAllCities().stream().collect(Collectors.groupingBy(city -> countryDao.findCountryByCode(city.getCountryCode()).getContinent(),Collectors.maxBy(Comparator.comparingInt(City::getPopulation))));
+        ciudadesMasPobladas.entrySet().forEach(System.out::println);
     }
 }
diff --git a/src/main/java/com/oracle/stream/StreamEjemplo.java b/src/main/java/com/oracle/stream/StreamEjemplo.java
index 182e2d8..b0be897 100644
--- a/src/main/java/com/oracle/stream/StreamEjemplo.java
+++ b/src/main/java/com/oracle/stream/StreamEjemplo.java
@@ -16,9 +16,9 @@ public static void main(String[] args) {
         personList.add(new Person("Alisa", 7900, 26, "female", "New York"));
 
         // Crear una nueva persona y agregarla a la lista
-        List<Person> personList2 = personList.stream().map().collect(Collectors.toList());
+        //List<Person> personList2 = personList.stream().map().collect(Collectors.toList());
         // Convertir km a millas
-        List<Person> personList3 = personList2.stream().map().collect(Collectors.toList());
+        List<Person> personList3 = personList.stream().map(person -> {person.setKmPerYear((int)(person.getKmPerYear()*0.621371)); return person;}).peek(person -> System.out.println(person.getKmPerYear())).collect(Collectors.toList());
     }
 }
 
@@ -29,6 +29,14 @@ class Person {
     private String genre;
     private String city;
 
+    public int getKmPerYear() {
+        return kmPerYear;
+    }
+
+    public void setKmPerYear(int kmPerYear) {
+        this.kmPerYear = kmPerYear;
+    }
+
     public Person(String name, int kmPerYear, int age, String genre, String city) {
         this.name = name;
         this.kmPerYear = kmPerYear;