Merge pull request neetcode-gh#124 from rahulshishodia/271-encode-decode

refactor: updated encode and decode strings

Author: mitchellirvin

java/271-Encode-and-Decode-Strings.java

@@ -2,32 +2,27 @@ public class Solution {
 
     public String encode(List<String> strs) {
         StringBuilder encodedString = new StringBuilder();
-        for(String str: strs){
-            int length = str.length();
-            encodedString.append(length+"#");
-            encodedString.append(str);
+        for (String str : strs) {
+            encodedString.append(str.length())
+                    .append("#")
+                    .append(str);
         }
         return encodedString.toString();
     }
 
     public List<String> decode(String str) {
-        List<String> decodedStrings = new ArrayList();
-        for(int i =0;i<str.length();i++){
-            String length = "";
-            while(str.charAt(i) != '#'){
-                length += str.charAt(i);
-                i++;
-            }
-            int wordLength = Integer.parseInt(length);
-            i++;
 
-            String word = "";
-            for(int j=i;j<wordLength+i;j++){
-                word += str.charAt(j);
-            }
-            decodedStrings.add(word);
-            i=i+wordLength-1;
+        List<String> list = new ArrayList<>();
+        int i = 0;
+        while (i < str.length()) { 
+            int j = i;
+            while (str.charAt(j) != '#')
+                j++;
+
+            int length = Integer.valueOf(str.substring(i, j));
+            i = j + 1 + length;
+            list.add(str.substring(j + 1, i));
         }
-        return decodedStrings;
+        return list;
     }
 }