update 362 java

Author: yennanliu

README.md

@@ -1179,7 +1179,7 @@
 348| [Design Tic-Tac-Toe](https://leetcode.com/problems/design-tic-tac-toe/) | [Python](./leetcode_python/Design/design-tic-tac-toe.py) | _O(1)_ | _O(n^2)_ | Medium |matrix, array, 🔒, google, `fb`, `amazon`|  AGAIN****** (5)
 353| [Design Snake Game](https://leetcode.com/problems/design-snake-game/) |[Python](./leetcode_python/Design/design-snake-game.py), [Java](./leetcode_java/src/main/java/LeetCodeJava/Design/DesignSnakeGame.java) | _O(1)_ | _O(s)_ | Medium |good trick, Deque, 🔒, amazon, google, square, m$ | AGAIN*** (1)
 355| [Design Twitter](https://leetcode.com/problems/design-twitter/) | [Python](./leetcode_python/Design/design-twitter.py), [Java](./leetcode_java/src/main/java/LeetCodeJava/Design/DesignTwitter.java)| _O(klogu)_ | _O(t + f)_ | Medium | good trick, data structure, heapq, defaultdict, `amazon` | OK******** (6)
-362| [Design Hit Counter](https://leetcode.com/problems/design-hit-counter/) | [Java](./leetcode_java/src/main/java/LeetCodeJava/Design/DesignHitCounter.java) | _O(1), amortized_ | _O(k)_ | Medium |🔒| Deque,google | Again (1) (not start)
+362| [Design Hit Counter](https://leetcode.com/problems/design-hit-counter/) | [Java](./leetcode_java/src/main/java/LeetCodeJava/Design/DesignHitCounter.java) | _O(1), amortized_ | _O(k)_ | Medium |🔒| Deque,google | Again (1)
 0379| [Design Phone Directory](https://leetcode.com/problems/design-phone-directory/) | [C++](./C++/design-phone-directory.cpp) [Python](./leetcode_python/Design/design-phone-directory.py) | _O(1)_ | _O(n)_ | Medium |🔒| |
 380| [Insert Delete GetRandom O(1)](https://leetcode.com/problems/insert-delete-getrandom-o1/) | [Python](./leetcode_python/Design/insert_delete_get_random_O_1.py), [Java](./leetcode_java/src/main/java/LeetCodeJava/Design/InsertDeleteGetRandom0_1.java) | _O(1)_ | _O(n)_| Medium/Hard |set, list, dict, `amazon`,`fb`, google| OK* (5)
 0381| [Insert Delete GetRandom O(1) - Duplicates allowed](https://leetcode.com/problems/insert-delete-getrandom-o1-duplicates-allowed/) | [C++](./C++/insert-delete-getrandom-o1-duplicates-allowed.cpp) [Python](./leetcode_python/Design/insert-delete-getrandom-o1-duplicates-allowed.py) | _O(1)_ | _O(n)_ | Hard || |

leetcode_java/src/main/java/LeetCodeJava/Design/DesignHitCounter.java

@@ -55,6 +55,44 @@
 public class DesignHitCounter {
 
     // V0
+    // TODO: validate
+    class HitCounter {
+
+        /**  counter : {timestamp : cnt }
+         */
+        private Map<Integer, Integer> counter;
+
+        /** Initialize your data structure here. */
+        public HitCounter() {
+            counter = new HashMap<>(); // ?? check
+        }
+
+        /**
+         Record a hit.
+         @param timestamp - The current timestamp (in seconds granularity).
+         */
+        public void hit(int timestamp) {
+            // counter.put(timestamp, counter.getOrDefault(timestamp, 0) + 1);
+            int curCnt = counter.getOrDefault(counter,0);
+            //counter.putIfAbsent(timestamp, curCnt+1);
+            counter.put(timestamp, curCnt+1);
+        }
+
+        /**
+         Return the number of hits in the past 5 minutes.
+         @param timestamp - The current timestamp (in seconds granularity).
+         */
+        public int getHits(int timestamp) {
+            int val = 0;
+            for(Integer key : counter.keySet()){
+                if (key >= 0 && key <= timestamp - 60 * 5){
+                    //val += 1; // ??
+                    val += counter.get(key);
+                }
+            }
+            return val;
+        }
+    }
 
     // V1-1
     // https://leetcode.ca/2016-11-26-362-Design-Hit-Counter/

leetcode_java/src/main/java/dev/workspace6.java

@@ -657,4 +657,47 @@ private boolean canFind(char[][] board, String word, int x, int y, StringBuilder
       return false;
     }
 
+
+    // LC 362
+    // https://leetcode.ca/all/362.html
+    // 3.38 PM - 3.50 PM
+    class HitCounter {
+
+        /**  counter : {timestamp : cnt } ??
+         *
+         */
+        private Map<Integer, Integer> counter;
+
+        /** Initialize your data structure here. */
+        public HitCounter() {
+            counter = new HashMap<>(); // ?? check
+        }
+
+        /**
+         Record a hit.
+         @param timestamp - The current timestamp (in seconds granularity).
+         */
+        public void hit(int timestamp) {
+            // counter.put(timestamp, counter.getOrDefault(timestamp, 0) + 1);
+            int curCnt = counter.getOrDefault(counter,0);
+            //counter.putIfAbsent(timestamp, curCnt+1);
+            counter.put(timestamp, curCnt+1);
+        }
+
+        /**
+         Return the number of hits in the past 5 minutes.
+         @param timestamp - The current timestamp (in seconds granularity).
+         */
+        public int getHits(int timestamp) {
+            int val = 0;
+            for(Integer key : counter.keySet()){
+                if (key >= 0 && key <= timestamp - 60 * 5){
+                    //val += 1; // ??
+                    val += counter.get(key);
+                }
+            }
+            return val;
+        }
+    }
+
 }