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feat: add solutions to leetcode problem: No.0981. Time Based Key-Value Store
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‎solution/0900-0999/0981.Time Based Key-Value Store/README.md‎

Lines changed: 56 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -57,27 +57,81 @@ kv.get("foo", 5); // 输出 "bar2"  
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<li><code>TimeMap.set</code> 和&nbsp;<code>TimeMap.get</code>&nbsp;函数在每个测试用例中将(组合)调用总计&nbsp;<code>120000</code> 次。</li>
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</ol>
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## 解法
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<!-- 这里可写通用的实现逻辑 -->
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嵌套哈希表实现。
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<!-- tabs:start -->
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### **Python3**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```python
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class TimeMap:
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def __init__(self):
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"""
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Initialize your data structure here.
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"""
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self.ktv = collections.defaultdict(list)
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def set(self, key: str, value: str, timestamp: int) -> None:
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self.ktv[key].append((timestamp, value))
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def get(self, key: str, timestamp: int) -> str:
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if key not in self.ktv:
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return ''
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tv = self.ktv[key]
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# #查找第一个大于timestamp的
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i = bisect.bisect_right(tv, (timestamp, chr(127)))
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return tv[i - 1][1] if i else ''
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# Your TimeMap object will be instantiated and called as such:
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# obj = TimeMap()
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# obj.set(key,value,timestamp)
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# param_2 = obj.get(key,timestamp)
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```
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### **Java**
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<!-- 这里可写当前语言的特殊实现逻辑 -->
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```java
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class TimeMap {
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private Map<String, TreeMap<Integer, String>> ktv;
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/** Initialize your data structure here. */
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public TimeMap() {
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ktv = new HashMap<>();
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}
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public void set(String key, String value, int timestamp) {
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TreeMap<Integer, String> tv = ktv.getOrDefault(key, new TreeMap<>());
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tv.put(timestamp, value);
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ktv.put(key, tv);
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}
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public String get(String key, int timestamp) {
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if (!ktv.containsKey(key)) {
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return "";
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}
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TreeMap<Integer, String> tv = ktv.get(key);
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Integer t = tv.floorKey(timestamp);
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return t == null ? "" : tv.get(t);
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}
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}
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/**
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* Your TimeMap object will be instantiated and called as such:
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* TimeMap obj = new TimeMap();
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* obj.set(key,value,timestamp);
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* String param_2 = obj.get(key,timestamp);
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*/
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```
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### **...**

‎solution/0900-0999/0981.Time Based Key-Value Store/README_EN.md‎

Lines changed: 53 additions & 27 deletions
Original file line numberDiff line numberDiff line change
@@ -6,40 +6,26 @@
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<p>Create a timebased key-value store class&nbsp;<code>TimeMap</code>, that supports two operations.</p>
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<p>1. <code>set(string key, string value, int timestamp)</code></p>
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<ul>
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<li>Stores the <code>key</code> and <code>value</code>, along with the given <code>timestamp</code>.</li>
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</ul>
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<p>2. <code>get(string key, int timestamp)</code></p>
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<ul>
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<li>Returns a value such that <code>set(key, value, timestamp_prev)</code> was called previously, with <code>timestamp_prev &lt;= timestamp</code>.</li>
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<li>If there are multiple such values, it returns the one with the largest <code>timestamp_prev</code>.</li>
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<li>If there are no values, it returns the empty string (<code>&quot;&quot;</code>).</li>
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</ul>
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<p>&nbsp;</p>
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<div>
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<p><strong>Example 1:</strong></p>
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<pre>
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<strong>Input: </strong>inputs = <span id="example-input-1-1">[&quot;TimeMap&quot;,&quot;set&quot;,&quot;get&quot;,&quot;get&quot;,&quot;set&quot;,&quot;get&quot;,&quot;get&quot;]</span>, inputs = <span id="example-input-1-2">[[],[&quot;foo&quot;,&quot;bar&quot;,1],[&quot;foo&quot;,1],[&quot;foo&quot;,3],[&quot;foo&quot;,&quot;bar2&quot;,4],[&quot;foo&quot;,4],[&quot;foo&quot;,5]]</span>
@@ -66,14 +52,10 @@ kv.get(&quot;foo&quot;, 5); //output &quot;bar2&quot; &nbsp;
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</pre>
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<div>
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<p><strong>Example 2:</strong></p>
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<pre>
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<strong>Input: </strong>inputs = <span id="example-input-2-1">[&quot;TimeMap&quot;,&quot;set&quot;,&quot;set&quot;,&quot;get&quot;,&quot;get&quot;,&quot;get&quot;,&quot;get&quot;,&quot;get&quot;]</span>, inputs = <span id="example-input-2-2">[[],[&quot;love&quot;,&quot;high&quot;,10],[&quot;love&quot;,&quot;low&quot;,20],[&quot;love&quot;,5],[&quot;love&quot;,10],[&quot;love&quot;,15],[&quot;love&quot;,20],[&quot;love&quot;,25]]</span>
@@ -86,16 +68,10 @@ kv.get(&quot;foo&quot;, 5); //output &quot;bar2&quot; &nbsp;
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</div>
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<p>&nbsp;</p>
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<p><strong>Note:</strong></p>
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<ol>
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<li>All key/value strings are lowercase.</li>
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<li>All key/value strings have&nbsp;length in the range&nbsp;<code>[1, 100]</code></li>
@@ -104,22 +80,72 @@ kv.get(&quot;foo&quot;, 5); //output &quot;bar2&quot; &nbsp;
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<li><code>TimeMap.set</code> and <code>TimeMap.get</code>&nbsp;functions will be called a total of <code>120000</code> times (combined) per test case.</li>
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</ol>
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## Solutions
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<!-- tabs:start -->
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### **Python3**
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```python
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class TimeMap:
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def __init__(self):
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"""
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Initialize your data structure here.
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"""
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self.ktv = collections.defaultdict(list)
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def set(self, key: str, value: str, timestamp: int) -> None:
99+
self.ktv[key].append((timestamp, value))
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def get(self, key: str, timestamp: int) -> str:
102+
if key not in self.ktv:
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return ''
104+
tv = self.ktv[key]
105+
i = bisect.bisect_right(tv, (timestamp, chr(127)))
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return tv[i - 1][1] if i else ''
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# Your TimeMap object will be instantiated and called as such:
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# obj = TimeMap()
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# obj.set(key,value,timestamp)
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# param_2 = obj.get(key,timestamp)
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```
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### **Java**
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```java
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class TimeMap {
120+
private Map<String, TreeMap<Integer, String>> ktv;
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122+
/** Initialize your data structure here. */
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public TimeMap() {
124+
ktv = new HashMap<>();
125+
}
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public void set(String key, String value, int timestamp) {
128+
TreeMap<Integer, String> tv = ktv.getOrDefault(key, new TreeMap<>());
129+
tv.put(timestamp, value);
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ktv.put(key, tv);
131+
}
132+
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public String get(String key, int timestamp) {
134+
if (!ktv.containsKey(key)) {
135+
return "";
136+
}
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TreeMap<Integer, String> tv = ktv.get(key);
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Integer t = tv.floorKey(timestamp);
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return t == null ? "" : tv.get(t);
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}
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}
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/**
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* Your TimeMap object will be instantiated and called as such:
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* TimeMap obj = new TimeMap();
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* obj.set(key,value,timestamp);
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* String param_2 = obj.get(key,timestamp);
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*/
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```
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### **...**
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,30 @@
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class TimeMap {
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private Map<String, TreeMap<Integer, String>> ktv;
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/** Initialize your data structure here. */
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public TimeMap() {
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ktv = new HashMap<>();
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}
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public void set(String key, String value, int timestamp) {
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TreeMap<Integer, String> tv = ktv.getOrDefault(key, new TreeMap<>());
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tv.put(timestamp, value);
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ktv.put(key, tv);
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}
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public String get(String key, int timestamp) {
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if (!ktv.containsKey(key)) {
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return "";
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}
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TreeMap<Integer, String> tv = ktv.get(key);
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Integer t = tv.floorKey(timestamp);
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return t == null ? "" : tv.get(t);
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}
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}
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/**
26+
* Your TimeMap object will be instantiated and called as such:
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* TimeMap obj = new TimeMap();
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* obj.set(key,value,timestamp);
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* String param_2 = obj.get(key,timestamp);
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*/
Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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class TimeMap:
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def __init__(self):
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"""
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Initialize your data structure here.
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"""
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self.ktv = collections.defaultdict(list)
8+
9+
def set(self, key: str, value: str, timestamp: int) -> None:
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self.ktv[key].append((timestamp, value))
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def get(self, key: str, timestamp: int) -> str:
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if key not in self.ktv:
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return ''
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tv = self.ktv[key]
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i = bisect.bisect_right(tv, (timestamp, chr(127)))
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return tv[i - 1][1] if i else ''
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# Your TimeMap object will be instantiated and called as such:
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# obj = TimeMap()
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# obj.set(key,value,timestamp)
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# param_2 = obj.get(key,timestamp)

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