feat: add solutions to lc problem: No.0731 (doocs#3919)

No.0731.My Calendar II

Author: yanglbme

solution/0700-0799/0731.My Calendar II/README.md

@@ -1,28 +1,29 @@
 class MyCalendarTwo {
 public:
-    map<int, int> m;
-
     MyCalendarTwo() {
     }
 
-    bool book(int start, int end) {
-        ++m[start];
-        --m[end];
+    bool book(int startTime, int endTime) {
+        ++m[startTime];
+        --m[endTime];
         int s = 0;
         for (auto& [_, v] : m) {
             s += v;
             if (s > 2) {
-                --m[start];
-                ++m[end];
+                --m[startTime];
+                ++m[endTime];
                 return false;
             }
         }
         return true;
     }
+
+private:
+    map<int, int> m;
 };
 
 /**
  * Your MyCalendarTwo object will be instantiated and called as such:
  * MyCalendarTwo* obj = new MyCalendarTwo();
- * bool param_1 = obj->book(start,end);
- */
+ * bool param_1 = obj->book(startTime,endTime);
+ */

solution/0700-0799/0731.My Calendar II/README_EN.md

@@ -1,28 +1,30 @@
 type MyCalendarTwo struct {
-	*redblacktree.Tree
+	rbt *redblacktree.Tree[int, int]
 }
 
 func Constructor() MyCalendarTwo {
-	return MyCalendarTwo{redblacktree.NewWithIntComparator()}
+	return MyCalendarTwo{rbt: redblacktree.New[int, int]()}
 }
 
-func (this *MyCalendarTwo) Book(start int, end int) bool {
-	add := func(key, val int) {
-		if v, ok := this.Get(key); ok {
-			this.Put(key, v.(int)+val)
+func (this *MyCalendarTwo) Book(startTime int, endTime int) bool {
+	merge := func(x, v int) {
+		c, _ := this.rbt.Get(x)
+		if c+v == 0 {
+			this.rbt.Remove(x)
 		} else {
-			this.Put(key, val)
+			this.rbt.Put(x, c+v)
 		}
 	}
-	add(start, 1)
-	add(end, -1)
+
+	merge(startTime, 1)
+	merge(endTime, -1)
+
 	s := 0
-	it := this.Iterator()
-	for it.Next() {
-		s += it.Value().(int)
+	for _, v := range this.rbt.Values() {
+		s += v
 		if s > 2 {
-			add(start, -1)
-			add(end, 1)
+			merge(startTime, -1)
+			merge(endTime, 1)
 			return false
 		}
 	}
@@ -32,5 +34,5 @@ func (this *MyCalendarTwo) Book(start int, end int) bool {
 /**
  * Your MyCalendarTwo object will be instantiated and called as such:
  * obj := Constructor();
- * param_1 := obj.Book(start,end);
- */
+ * param_1 := obj.Book(startTime,endTime);
+ */

solution/0700-0799/0731.My Calendar II/Solution.cpp

@@ -1,18 +1,18 @@
 class MyCalendarTwo {
-    private Map<Integer, Integer> tm = new TreeMap<>();
+    private final Map<Integer, Integer> tm = new TreeMap<>();
 
     public MyCalendarTwo() {
     }
 
-    public boolean book(int start, int end) {
-        tm.put(start, tm.getOrDefault(start, 0) + 1);
-        tm.put(end, tm.getOrDefault(end, 0) - 1);
+    public boolean book(int startTime, int endTime) {
+        tm.merge(startTime, 1, Integer::sum);
+        tm.merge(endTime, -1, Integer::sum);
         int s = 0;
         for (int v : tm.values()) {
             s += v;
             if (s > 2) {
-                tm.put(start, tm.get(start) - 1);
-                tm.put(end, tm.get(end) + 1);
+                tm.merge(startTime, -1, Integer::sum);
+                tm.merge(endTime, 1, Integer::sum);
                 return false;
             }
         }
@@ -23,5 +23,5 @@ public boolean book(int start, int end) {
 /**
  * Your MyCalendarTwo object will be instantiated and called as such:
  * MyCalendarTwo obj = new MyCalendarTwo();
- * boolean param_1 = obj.book(start,end);
- */
+ * boolean param_1 = obj.book(startTime,endTime);
+ */

solution/0700-0799/0731.My Calendar II/Solution.go

@@ -1,32 +1,34 @@
 var MyCalendarTwo = function () {
-    this.events = [];
-    this.overlaps = [];
+    this.tm = {};
 };
 
 /**
- * @param {number} start
- * @param {number} end
+ * @param {number} startTime
+ * @param {number} endTime
  * @return {boolean}
  */
-MyCalendarTwo.prototype.book = function (start, end) {
-    for (let [s, e] of this.overlaps) {
-        if (Math.max(start, s) < Math.min(end, e)) {
-            return false;
-        }
-    }
+MyCalendarTwo.prototype.book = function (startTime, endTime) {
+    this.tm[startTime] = (this.tm[startTime] || 0) + 1;
+    this.tm[endTime] = (this.tm[endTime] || 0) - 1;
+    let s = 0;
 
-    for (let [s, e] of this.events) {
-        if (Math.max(start, s) < Math.min(end, e)) {
-            this.overlaps.push([Math.max(start, s), Math.min(end, e)]);
+    for (const v of Object.values(this.tm)) {
+        s += v;
+        if (s > 2) {
+            if (--this.tm[startTime] === 0) {
+                delete this.tm[startTime];
+            }
+            if (++this.tm[endTime] === 0) {
+                delete this.tm[endTime];
+            }
+            return false;
         }
     }
-
-    this.events.push([start, end]);
     return true;
 };
 
 /**
  * Your MyCalendarTwo object will be instantiated and called as such:
  * var obj = new MyCalendarTwo()
- * var param_1 = obj.book(start,end)
+ * var param_1 = obj.book(startTime,endTime)
  */

solution/0700-0799/0731.My Calendar II/Solution.java

@@ -5,19 +5,19 @@ class MyCalendarTwo:
     def __init__(self):
         self.sd = SortedDict()
 
-    def book(self, start: int, end: int) -> bool:
-        self.sd[start] = self.sd.get(start, 0) + 1
-        self.sd[end] = self.sd.get(end, 0) - 1
+    def book(self, startTime: int, endTime: int) -> bool:
+        self.sd[startTime] = self.sd.get(startTime, 0) + 1
+        self.sd[endTime] = self.sd.get(endTime, 0) - 1
         s = 0
         for v in self.sd.values():
             s += v
             if s > 2:
-                self.sd[start] -= 1
-                self.sd[end] += 1
+                self.sd[startTime] -= 1
+                self.sd[endTime] += 1
                 return False
         return True
 
 
 # Your MyCalendarTwo object will be instantiated and called as such:
 # obj = MyCalendarTwo()
-# param_1 = obj.book(start,end)
+# param_1 = obj.book(startTime,endTime)

solution/0700-0799/0731.My Calendar II/Solution.js

@@ -1,32 +1,30 @@
 class MyCalendarTwo {
-    private events: [number, number][];
-    private overlaps: [number, number][];
+    private tm: Record<number, number> = {};
 
-    constructor() {
-        this.events = [];
-        this.overlaps = [];
-    }
+    constructor() {}
 
-    book(start: number, end: number): boolean {
-        for (const [s, e] of this.overlaps) {
-            if (Math.max(start, s) < Math.min(end, e)) {
+    book(startTime: number, endTime: number): boolean {
+        this.tm[startTime] = (this.tm[startTime] ?? 0) + 1;
+        this.tm[endTime] = (this.tm[endTime] ?? 0) - 1;
+        let s = 0;
+        for (const v of Object.values(this.tm)) {
+            s += v;
+            if (s > 2) {
+                if (--this.tm[startTime] === 0) {
+                    delete this.tm[startTime];
+                }
+                if (++this.tm[endTime] === 0) {
+                    delete this.tm[endTime];
+                }
                 return false;
             }
         }
-
-        for (const [s, e] of this.events) {
-            if (Math.max(start, s) < Math.min(end, e)) {
-                this.overlaps.push([Math.max(start, s), Math.min(end, e)]);
-            }
-        }
-
-        this.events.push([start, end]);
         return true;
     }
 }
 
 /**
  * Your MyCalendarTwo object will be instantiated and called as such:
  * var obj = new MyCalendarTwo()
- * var param_1 = obj.book(start,end)
+ * var param_1 = obj.book(startTime,endTime)
  */