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Commit 968ccbb

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feat: add golang solution to lc problem: No. 0981.Time Based Key-Value Store
1 parent 535ff81 commit 968ccbb

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

Lines changed: 43 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -28,14 +28,14 @@
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<pre><strong>输入:</strong>inputs = [&quot;TimeMap&quot;,&quot;set&quot;,&quot;get&quot;,&quot;get&quot;,&quot;set&quot;,&quot;get&quot;,&quot;get&quot;], inputs = [[],[&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]]
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<strong>输出:</strong>[null,null,&quot;bar&quot;,&quot;bar&quot;,null,&quot;bar2&quot;,&quot;bar2&quot;]
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<strong>解释:</strong>&nbsp;
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TimeMap kv; &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar&quot;, 1); // 存储键 &quot;foo&quot; 和值 &quot;bar&quot; 以及时间戳 timestamp = 1 &nbsp;
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kv.get(&quot;foo&quot;, 1); // 输出 &quot;bar&quot; &nbsp;
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kv.get(&quot;foo&quot;, 3); // 输出 &quot;bar&quot; 因为在时间戳 3 和时间戳 2 处没有对应 &quot;foo&quot; 的值,所以唯一的值位于时间戳 1 处(即 &quot;bar&quot;) &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar2&quot;, 4); &nbsp;
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kv.get(&quot;foo&quot;, 4); // 输出 &quot;bar2&quot; &nbsp;
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kv.get(&quot;foo&quot;, 5); // 输出 &quot;bar2&quot; &nbsp;
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<strong>解释:</strong>&nbsp;
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TimeMap kv; &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar&quot;, 1); // 存储键 &quot;foo&quot; 和值 &quot;bar&quot; 以及时间戳 timestamp = 1 &nbsp;
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kv.get(&quot;foo&quot;, 1); // 输出 &quot;bar&quot; &nbsp;
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kv.get(&quot;foo&quot;, 3); // 输出 &quot;bar&quot; 因为在时间戳 3 和时间戳 2 处没有对应 &quot;foo&quot; 的值,所以唯一的值位于时间戳 1 处(即 &quot;bar&quot;) &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar2&quot;, 4); &nbsp;
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kv.get(&quot;foo&quot;, 4); // 输出 &quot;bar2&quot; &nbsp;
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kv.get(&quot;foo&quot;, 5); // 输出 &quot;bar2&quot; &nbsp;
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</pre>
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@@ -134,6 +134,41 @@ class TimeMap {
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*/
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```
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### **Go**
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因为 timestamp 是一直增长的,所以可以用二分查找快速找到值
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```go
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type pair struct {
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timestamp int
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value string
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}
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type TimeMap struct {
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data map[string][]pair
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}
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func Constructor() TimeMap {
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return TimeMap{data: make(map[string][]pair)}
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}
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func (m *TimeMap) Set(key string, value string, timestamp int) {
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m.data[key] = append(m.data[key], pair{timestamp, value})
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}
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func (m *TimeMap) Get(key string, timestamp int) string {
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pairs := m.data[key]
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// sort.Search return the smallest index i in [0, n) at which f(i) is true
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i := sort.Search(len(pairs), func(i int) bool {
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return pairs[i].timestamp > timestamp
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})
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if i > 0 {
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return pairs[i-1].value
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}
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return ""
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}
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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: 43 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -32,21 +32,21 @@
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<strong>Output: </strong><span id="example-output-1">[null,null,&quot;bar&quot;,&quot;bar&quot;,null,&quot;bar2&quot;,&quot;bar2&quot;]</span>
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<strong>Explanation: </strong><span id="example-output-1">&nbsp;
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<strong>Explanation: </strong><span id="example-output-1">&nbsp;
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TimeMap kv; &nbsp;
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TimeMap kv; &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar&quot;, 1); // store the key &quot;foo&quot; and value &quot;bar&quot; along with timestamp = 1 &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar&quot;, 1); // store the key &quot;foo&quot; and value &quot;bar&quot; along with timestamp = 1 &nbsp;
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kv.get(&quot;foo&quot;, 1); // output &quot;bar&quot; &nbsp;
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kv.get(&quot;foo&quot;, 1); // output &quot;bar&quot; &nbsp;
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kv.get(&quot;foo&quot;, 3); // output &quot;bar&quot; since there is no value corresponding to foo at timestamp 3 and timestamp 2, then the only value is at timestamp 1 ie &quot;bar&quot; &nbsp;
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kv.get(&quot;foo&quot;, 3); // output &quot;bar&quot; since there is no value corresponding to foo at timestamp 3 and timestamp 2, then the only value is at timestamp 1 ie &quot;bar&quot; &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar2&quot;, 4); &nbsp;
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kv.set(&quot;foo&quot;, &quot;bar2&quot;, 4); &nbsp;
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47-
kv.get(&quot;foo&quot;, 4); // output &quot;bar2&quot; &nbsp;
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kv.get(&quot;foo&quot;, 4); // output &quot;bar2&quot; &nbsp;
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49-
kv.get(&quot;foo&quot;, 5); //output &quot;bar2&quot; &nbsp;
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kv.get(&quot;foo&quot;, 5); //output &quot;bar2&quot; &nbsp;
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</span>
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@@ -148,6 +148,41 @@ class TimeMap {
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*/
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```
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### **Go**
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Because timestamp is always increasing, you can use binary search to quickly find the value
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```go
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type pair struct {
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timestamp int
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value string
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}
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type TimeMap struct {
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data map[string][]pair
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}
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func Constructor() TimeMap {
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return TimeMap{data: make(map[string][]pair)}
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}
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func (m *TimeMap) Set(key string, value string, timestamp int) {
170+
m.data[key] = append(m.data[key], pair{timestamp, value})
171+
}
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func (m *TimeMap) Get(key string, timestamp int) string {
174+
pairs := m.data[key]
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// sort.Search return the smallest index i in [0, n) at which f(i) is true
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i := sort.Search(len(pairs), func(i int) bool {
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return pairs[i].timestamp > timestamp
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})
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if i > 0 {
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return pairs[i-1].value
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}
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return ""
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}
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```
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### **...**
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```
Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,28 @@
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type pair struct {
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timestamp int
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value string
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}
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type TimeMap struct {
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data map[string][]pair
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}
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func Constructor() TimeMap {
11+
return TimeMap{data: make(map[string][]pair)}
12+
}
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func (m *TimeMap) Set(key string, value string, timestamp int) {
15+
m.data[key] = append(m.data[key], pair{timestamp, value})
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}
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func (m *TimeMap) Get(key string, timestamp int) string {
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pairs := m.data[key]
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// sort.Search return the smallest index i in [0, n) at which f(i) is true
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i := sort.Search(len(pairs), func(i int) bool {
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return pairs[i].timestamp > timestamp
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})
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if i > 0 {
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return pairs[i-1].value
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}
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return ""
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}

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