Merge pull request #2556 from t3chkid/main

Adds Kotlin solution for problem #271

Author: a93a

README.md

@@ -55,7 +55,7 @@ If you would like to have collaborator permissions on the repo to merge your own
 <sub>[0347 - Top K Frequent Elements](https://leetcode.com/problems/top-k-frequent-elements/)</sub> | <sub><div align='center'>[✔️](c%2F0347-top-k-frequent-elements.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0347-top-k-frequent-elements.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0347-top-k-frequent-elements.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0347-top-k-frequent-elements.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0347-top-k-frequent-elements.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0347-top-k-frequent-elements.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0347-top-k-frequent-elements.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0347-top-k-frequent-elements.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0347-top-k-frequent-elements.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0347-top-k-frequent-elements.rs)</div></sub> | <sub><div align='center'>[✔️](scala%2F0347-top-k-frequent-elements.scala)</div></sub> | <sub><div align='center'>[✔️](swift%2F0347-top-k-frequent-elements.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0347-top-k-frequent-elements.ts)</div></sub>
 <sub>[0238 - Product of Array Except Self](https://leetcode.com/problems/product-of-array-except-self/)</sub> | <sub><div align='center'>[✔️](c%2F0238-product-of-array-except-self.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0238-product-of-array-except-self.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0238-product-of-array-except-self.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0238-product-of-array-except-self.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0238-product-of-array-except-self.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0238-product-of-array-except-self.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0238-product-of-array-except-self.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0238-product-of-array-except-self.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0238-product-of-array-except-self.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0238-product-of-array-except-self.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0238-product-of-array-except-self.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0238-product-of-array-except-self.ts)</div></sub>
 <sub>[0036 - Valid Sudoku](https://leetcode.com/problems/valid-sudoku/)</sub> | <sub><div align='center'>[✔️](c%2F0036-valid-sudoku.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0036-valid-sudoku.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0036-valid-sudoku.cs)</div></sub> | <sub><div align='center'>[✔️](dart%2F0036-valid-sudoku.dart)</div></sub> | <sub><div align='center'>[✔️](go%2F0036-valid-sudoku.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0036-valid-sudoku.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0036-valid-sudoku.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0036-valid-sudoku.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0036-valid-sudoku.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0036-valid-sudoku.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0036-valid-sudoku.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](typescript%2F0036-valid-sudoku.ts)</div></sub>
-<sub>[0271 - Encode and Decode Strings](https://leetcode.com/problems/encode-and-decode-strings/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](cpp%2F0271-encode-and-decode-strings.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0271-encode-and-decode-strings.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0271-encode-and-decode-strings.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0271-encode-and-decode-strings.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0271-encode-and-decode-strings.js)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](python%2F0271-encode-and-decode-strings.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0271-encode-and-decode-strings.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0271-encode-and-decode-strings.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0271-encode-and-decode-strings.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0271-encode-and-decode-strings.ts)</div></sub>
+<sub>[0271 - Encode and Decode Strings](https://leetcode.com/problems/encode-and-decode-strings/)</sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](cpp%2F0271-encode-and-decode-strings.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0271-encode-and-decode-strings.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0271-encode-and-decode-strings.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0271-encode-and-decode-strings.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0271-encode-and-decode-strings.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0271-encode-and-decode-strings.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0271-encode-and-decode-strings.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0271-encode-and-decode-strings.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0271-encode-and-decode-strings.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0271-encode-and-decode-strings.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0271-encode-and-decode-strings.ts)</div></sub>
 <sub>[0128 - Longest Consecutive Sequence](https://leetcode.com/problems/longest-consecutive-sequence/)</sub> | <sub><div align='center'>[✔️](c%2F0128-longest-consecutive-sequence.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0128-longest-consecutive-sequence.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0128-longest-consecutive-sequence.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0128-longest-consecutive-sequence.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0128-longest-consecutive-sequence.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0128-longest-consecutive-sequence.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0128-longest-consecutive-sequence.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0128-longest-consecutive-sequence.py)</div></sub> | <sub><div align='center'>[✔️](ruby%2F0128-longest-consecutive-sequence.rb)</div></sub> | <sub><div align='center'>[✔️](rust%2F0128-longest-consecutive-sequence.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0128-longest-consecutive-sequence.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0128-longest-consecutive-sequence.ts)</div></sub>
 <sub>[0075 - Sort Colors](https://leetcode.com/problems/sort-colors/)</sub> | <sub><div align='center'>[✔️](c%2F0075-sort-colors.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0075-Sort-colors.cpp)</div></sub> | <sub><div align='center'>[✔️](csharp%2F0075-sort-colors.cs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0075-sort-colors.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0075-sort-colors.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0075-sort-colors.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0075-sort-colors.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0075-sort-colors.py)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](rust%2F0075-sort-colors.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0075-sort-colors.swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0075-sort-colors.ts)</div></sub>
 <sub>[0535 - Encode and Decode TinyURL](https://leetcode.com/problems/encode-and-decode-tinyurl/)</sub> | <sub><div align='center'>[✔️](c%2F0535-encode-and-decode-tinyurl.c)</div></sub> | <sub><div align='center'>[✔️](cpp%2F0535-encode-and-decode-tinyurl.cpp)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](go%2F0535-encode-and-decode-tinyurl.go)</div></sub> | <sub><div align='center'>[✔️](java%2F0535-encode-and-decode-tinyurl.java)</div></sub> | <sub><div align='center'>[✔️](javascript%2F0535-encode-and-decode-tinyurl.js)</div></sub> | <sub><div align='center'>[✔️](kotlin%2F0535-encode-and-decode-tinyurl.kt)</div></sub> | <sub><div align='center'>[✔️](python%2F0535-encode-and-decode-tinyurl.py)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](rust%2F0535-encode-and-decode-tinyURL.rs)</div></sub> | <sub><div align='center'>❌</div></sub> | <sub><div align='center'>[✔️](swift%2F0535-Encode-and-Decode-TinyURL.Swift)</div></sub> | <sub><div align='center'>[✔️](typescript%2F0535-encode-and-decode-tinyurl.ts)</div></sub>

kotlin/0271-encode-and-decode-strings.kt

@@ -0,0 +1,43 @@
+package kotlin
+
+class Codec {
+    // Encodes a list of strings to a single string.
+    fun encode(strs: List<String>): String {
+        val stringBuilder = StringBuilder()
+        for (string in strs) {
+            for (char in string) {
+                stringBuilder.append(char.toInt()) // char.code in newer version's of Kotlin
+                stringBuilder.append(CHAR_DELIMITER)
+            }
+            stringBuilder.append(STRING_DELIMITER)
+        }
+        return stringBuilder.toString()
+    }
+
+    // Decodes a single string to a list of strings.
+    fun decode(s: String): List<String> {
+        val stringBuilder = StringBuilder()
+        val resultantList = mutableListOf<String>()
+        var i = 0
+        while (i in s.indices) {
+            while (s[i] != STRING_DELIMITER) {
+                var charIntegerValue = ""
+                while (s[i] != CHAR_DELIMITER) {
+                    charIntegerValue += s[i]
+                    i++
+                }
+                stringBuilder.append(charIntegerValue.toInt().toChar())
+                i++
+            }
+            resultantList.add(stringBuilder.toString())
+            stringBuilder.clear()
+            i++
+        }
+        return resultantList
+    }
+
+    companion object {
+        private const val CHAR_DELIMITER = '|'
+        private const val STRING_DELIMITER = '/'
+    }
+}