2020-11-30 Update: Added "Count IP Addresses" and "Convert A String to A Number"

fartem · fartem · commit 9de84bde40fb · 2020-11-30T07:10:08.000+03:00
diff --git a/README.md b/README.md
@@ -24,6 +24,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
 | Century From Year | [Link](https://www.codewars.com/kata/5a3fe3dde1ce0e8ed6000097) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/CenturyFromYear.java) |
 | Color Ghost | [Link](https://www.codewars.com/kata/53f1015fa9fe02cbda00111a) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ColorGhost.java) |
 | Convert a Boolean to a String | [Link](https://www.codewars.com/kata/551b4501ac0447318f0009cd) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertABooleanToAString.java) |
+| Convert a String to a Number | [Link](https://www.codewars.com/kata/544675c6f971f7399a000e79) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertAStringToANumber.java) |
 | Convert to Binary | [Link](https://www.codewars.com/kata/59fca81a5712f9fa4700159a) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertToBinary.java) |
 | Counting sheep... | [Link](https://www.codewars.com/kata/54edbc7200b811e956000556) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/CountingSheep.java) |
 | Count of positives / sum of negatives | [Link](https://www.codewars.com/kata/576bb71bbbcf0951d5000044) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/CountOfPositivesSumOfNegatives.java) |
@@ -178,6 +179,7 @@ Profile on Codewars: [fartem](https://www.codewars.com/users/fartem).
 
 | Name | Link to Codewars | Link to solution |
 | --- | --- | --- |
+| Count IP Addresses | [Link](https://www.codewars.com/kata/526989a41034285187000de4) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/CountIPAddresses.java) |
 | Human Readable Time | [Link](https://www.codewars.com/kata/52685f7382004e774f0001f7) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/HumanReadableTime.java) |
 | int32 to IPv4 | [Link](https://www.codewars.com/kata/52e88b39ffb6ac53a400022e) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/Int32ToIPv4.java) |
 | Longest Common Subsequence | [Link](https://www.codewars.com/kata/52685f7382004e774f0001f7) | [Link](https://github.com/fartem/codewars-java/blob/master/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/LongestCommonSubsequence.java) |
diff --git a/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/CountIPAddresses.java b/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu5/CountIPAddresses.java
@@ -0,0 +1,26 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu5;
+
+// https://www.codewars.com/kata/526989a41034285187000de4
+public class CountIPAddresses {
+
+    private final String start;
+    private final String end;
+
+    public CountIPAddresses(String start, String end) {
+        this.start = start;
+        this.end = end;
+    }
+
+    public long solution() {
+        return (int) (convertToLong(end) - convertToLong(start));
+    }
+
+    private long convertToLong(String ip) {
+        long res = 0;
+        for (String s : ip.split("[.]") ) {
+            res = res * 256 + Long.parseLong(s);
+        }
+        return res;
+    }
+
+}
diff --git a/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertAStringToANumber.java b/src/main/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertAStringToANumber.java
@@ -0,0 +1,16 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu8;
+
+// https://www.codewars.com/kata/544675c6f971f7399a000e79
+public class ConvertAStringToANumber {
+
+    private final String input;
+
+    public ConvertAStringToANumber(String input) {
+        this.input = input;
+    }
+
+    public int solution() {
+        return Integer.parseInt(input);
+    }
+
+}
diff --git a/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu5/CountIPAddressesTest.java b/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu5/CountIPAddressesTest.java
@@ -0,0 +1,21 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu5;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class CountIPAddressesTest {
+
+    @Test
+    public void ipsBetween() {
+        assertEquals(
+                50,
+                new CountIPAddresses("10.0.0.0", "10.0.0.50").solution()
+        );
+        assertEquals(
+                246,
+                new CountIPAddresses("20.0.0.10", "20.0.1.0").solution()
+        );
+    }
+
+}
diff --git a/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu6/BitCountingTest.java b/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu6/BitCountingTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Test;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 public class BitCountingTest {
 
diff --git a/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu6/WorldBitsWarTest.java b/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu6/WorldBitsWarTest.java
@@ -2,7 +2,7 @@
 
 import org.junit.Test;
 
-import static org.junit.Assert.*;
+import static org.junit.Assert.assertEquals;
 
 public class WorldBitsWarTest {
 
diff --git a/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertAStringToANumberTest.java b/src/test/java/com/smlnskgmail/jaman/codewarsjava/kyu8/ConvertAStringToANumberTest.java
@@ -0,0 +1,41 @@
+package com.smlnskgmail.jaman.codewarsjava.kyu8;
+
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+public class ConvertAStringToANumberTest {
+
+    @Test
+    public void test1() {
+        assertEquals(
+                1234,
+                new ConvertAStringToANumber("1234").solution()
+        );
+    }
+
+    @Test
+    public void test2() {
+        assertEquals(
+                605,
+                new ConvertAStringToANumber("605").solution()
+        );
+    }
+
+    @Test
+    public void test3() {
+        assertEquals(
+                1405,
+                new ConvertAStringToANumber("1405").solution()
+        );
+    }
+
+    @Test
+    public void test4() {
+        assertEquals(
+                -7,
+                new ConvertAStringToANumber("-7").solution()
+        );
+    }
+
+}
