Решение задачи 6

src/com/school/faang/hashmap/задача_6/Solution.java

@@ -1,7 +1,101 @@
 package com.school.faang.hashmap.задача_6;
 
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 public class Solution {
     public static void main(String[] args) {
+        List<Tweet> tweets = new ArrayList<>();
+
+        tweets.add(new Tweet("@anna", List.of("#java", "#programming")));
+        tweets.add(new Tweet("@ivan", List.of("#java")));
+        tweets.add(new Tweet("@anna", List.of("#java")));
+        tweets.add(new Tweet("@anna", List.of("#java", "#programming","#sql")));
+        tweets.add(new Tweet("@ivan", List.of("#programming", "java")));
+        tweets.add(new Tweet("@ivan", List.of("#java", "#programming")));
+
+        Tweet tweet = new Tweet();
+
+        Map<String, String> topAuthors = tweet.findTopAuthors(tweets);
+
+        for (Map.Entry<String, String> entry : topAuthors.entrySet()) {
+            String hashtag = entry.getKey();
+            String author = entry.getValue();
+
+            System.out.println("Больше постов с хештегом " + hashtag + " написал " + author);
+        }
+    }
+}
+
+class  Tweet {
+    private String author;
+    private List<String> hashtags;
+
+    public Tweet (String author, List<String> hashtags) {
+        this.author = author;
+        this.hashtags = hashtags;
+    }
+
+    public Tweet () {}
+
+    private String getAuthor() {
+        return author;
+    }
+
+    private List<String> getHashtags() {
+        return hashtags;
+    }
+
+    public Map<String, String> findTopAuthors(List<Tweet> tweets) {
+        Map<String, String> topAuthors = new HashMap<>();
+
+        Map<String, Map<String, Integer>> authorsHashtagCounter = authorsHashtagCounter(tweets);
+
+        for (Map.Entry<String, Map<String, Integer>> entry : authorsHashtagCounter.entrySet()) {
+            String hashtag = entry.getKey();
+            Map<String, Integer> authorsHashtagsCounter = entry.getValue();
+
+            int maxTweet = 0;
+            String topAuthorName = "";
+
+            for (Map.Entry<String, Integer> innerEntry : authorsHashtagsCounter.entrySet()) {
+
+                String authorName = innerEntry.getKey();
+                int tweetCount = innerEntry.getValue();
+
+                if (tweetCount > maxTweet) {
+                    maxTweet = tweetCount;
+                    topAuthorName = authorName;
+                }
+            }
+
+            topAuthors.put(hashtag, topAuthorName);
+        }
+
+        return topAuthors;
+    }
+
+    private Map<String, Map<String, Integer>> authorsHashtagCounter(List<Tweet> tweets) {
+        Map<String, Map<String, Integer>> hashtagsCounter = new HashMap<>();
+
+        for (Tweet tweet : tweets) {
+            String name = tweet.getAuthor();
+
+            for (String hashtag : tweet.getHashtags()) {
+                Map<String, Integer> hashtagFrequency = hashtagsCounter.get(hashtag);
+
+                if (hashtagsCounter.containsKey(hashtag)) {
+                    hashtagFrequency.put(name, hashtagFrequency.getOrDefault(name, 0) + 1);
+                }else {
+                    hashtagFrequency = new HashMap<>();
+                    hashtagFrequency.put(name, 1);
+                    hashtagsCounter.put(hashtag, hashtagFrequency);
+                }
+            }
+        }
 
+        return hashtagsCounter;
     }
 }