Add links to YT. Add javadoc

Author: andrei-punko

src/main/java/by/andd3dfx/numeric/GettingCloserToTheTarget.java

@@ -17,6 +17,8 @@
  * Необходимо выяснить, может ли РК-2000 через заданное время t оказаться ровно на заданном расстоянии d от цели.
  * Для простоты считайте, что РК-2000 может мгновенно изменять свою скорость.
  * </pre>
+ *
+ * @see <a href="https://youtu.be/OXpju4Yzmo0">Video solution</a>
  */
 public class GettingCloserToTheTarget {
 

src/main/java/by/andd3dfx/numeric/NumberOfRecentCalls.java

@@ -32,6 +32,8 @@
  *   recentCounter.ping(3001);  // requests = [1, 100, 3001], range is [1,3001], return 3
  *   recentCounter.ping(3002);  // requests = [1, 100, 3001, 3002], range is [2,3002], return 3
  * </pre>
+ *
+ * @see <a href="https://youtu.be/546AEEzHneY">Video solution</a>
  */
 public class NumberOfRecentCalls {
 

src/main/java/by/andd3dfx/string/ConsecutiveCharacters.java

@@ -18,6 +18,8 @@
  * Output: 5
  * Explanation: The substring "eeeee" is of length 5 with the character 'e' only.
  * </pre>
+ *
+ * @see <a href="https://youtu.be/6dMXdSdOXG8">Video solution</a>
  */
 public class ConsecutiveCharacters {
 

src/main/java/by/andd3dfx/string/ReverseWordsInAStringIII.java

@@ -1,5 +1,20 @@
 package by.andd3dfx.string;
 
+/**
+ * <pre>
+ * <a href="https://leetcode.com/problems/reverse-words-in-a-string-iii/description/">Task description</a>
+ *
+ * Given a string s, reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.
+ *
+ * Example 1:
+ *   Input: s = "Let's take LeetCode contest"
+ *   Output: "s'teL ekat edoCteeL tsetnoc"
+ *
+ * Example 2:
+ *   Input: s = "Mr Ding"
+ *   Output: "rM gniD"
+ * </pre>
+ */
 public class ReverseWordsInAStringIII {
 
     public static String reverseWords(String s) {