#981: description update

Author: vetalapo

c-sharp/Problems/binary-search/TimeBasedKeyValueStore.cs

@@ -2,18 +2,45 @@
  * 981
  * Time Based Key-Value Store
  **
- * Design a time-based key-value data structure that
- * can store multiple values for the same key at different time stamps
- * and retrieve the key's value at a certain timestamp.
+ * Design a time-based key-value data structure that can store multiple values
+ * for the same key at different time stamps and retrieve the key's value at a certain timestamp.
  *
  * Implement the TimeMap class:
- *   TimeMap() Initializes the object of the data structure.
+ *   • TimeMap() Initializes the object of the data structure.
  *
- *   void set(String key, String value, int timestamp) Stores the key key with the value value at the given time timestamp.
+ *   • void set(String key, String value, int timestamp)
+ *     Stores the key key with the value value at the given time timestamp.
  *
- *   String get(String key, int timestamp) Returns a value such that set was called previously, with timestamp_prev <= timestamp.
- *     If there are multiple such values, it returns the value associated with the largest timestamp_prev.
+ *   • String get(String key, int timestamp)
+ *     Returns a value such that set was called previously,
+ *     with timestamp_prev <= timestamp.
+ *     If there are multiple such values,
+ *     it returns the value associated with the largest timestamp_prev.
  *     If there are no values, it returns "".
+ *
+ * Example 1:
+ *   Input
+ *     ["TimeMap", "set", "get", "get", "set", "get", "get"]
+ *     [[], ["foo", "bar", 1], ["foo", 1], ["foo", 3], ["foo", "bar2", 4], ["foo", 4], ["foo", 5]]
+ *
+ *   Output
+ *     [null, null, "bar", "bar", null, "bar2", "bar2"]
+ *
+ *   Explanation
+ *     TimeMap timeMap = new TimeMap();
+ *     timeMap.set("foo", "bar", 1);  // store the key "foo" and value "bar" along with timestamp = 1.
+ *     timeMap.get("foo", 1);         // return "bar"
+ *     timeMap.get("foo", 3);         // return "bar", since there is no value corresponding to foo at timestamp 3 and timestamp 2, then the only value is at timestamp 1 is "bar".
+ *     timeMap.set("foo", "bar2", 4); // store the key "foo" and value "bar2" along with timestamp = 4.
+ *     timeMap.get("foo", 4);         // return "bar2"
+ *     timeMap.get("foo", 5);         // return "bar2"
+ *
+ * Constraints:
+ *   • 1 <= key.length, value.length <= 100
+ *   • key and value consist of lowercase English letters and digits.
+ *   • 1 <= timestamp <= 10^7
+ *   • All the timestamps timestamp of set are strictly increasing.
+ *   • At most 2 * 10^5 calls will be made to set and get.
  **
  * https://leetcode.com/problems/time-based-key-value-store/
 ***/