update timer

Author: cch123

timer_ascii.md

@@ -605,51 +605,51 @@ func siftdownTimer(t []*timer, i int) {
 
 ```
                          |            +---+                                       
-                         |            | 5 |                                       
+                         |            |*5 |                                       
                          |            +---+                                       
                          |              |                                         
                          |        +-----+                                         
                          |        v                                               
                          |      +---+---+---+---+                                 
-                         |      | 7 | 3 | 2 | 6 |                                 
+                         |      | 7 | 3 |*2 | 6 |                                 
                          |      +---+---+---+---+                                 
 +-------------------+    |                |                                       
 |   siftdownTimer   |    |                +----------+                            
 +-------------------+    |                           v                            
      .---------.         |                         +---+---+---+---+              
-    (  before   )        |                         | 4 | 5 | 9 | 3 |              
+    (  before   )        |                         | 4 | 5 | 9 |*3 |              
      `---------'         |                         +---+---+---+---+              
                          |                                       |                
                          |                                       +-------------+  
                          |                                                     v  
                          |                                       +---+---+---+---+
-                         |                                       | 6 | 6 | 6 | 4 |
+                         |                                       | 6 | 6 | 6 |*4 |
                          |                                       +---+---+---+---+
                          |                                                        
                          v                                                        
                                                                                   
                                                                                   
                                                                                   
                          |            +---+                                       
-                         |            | 2 |                                       
+                         |            |*2 |                                       
                          |            +---+                                       
                          |              |                                         
                          |        +-----+                                         
                          |        v                                               
                          |      +---+---+---+---+                                 
-                         |      | 7 | 3 | 3 | 6 |                                 
+                         |      | 7 | 3 |*3 | 6 |                                 
                          |      +---+---+---+---+                                 
 +-------------------+    |                |                                       
 |   siftdownTimer   |    |                +----------+                            
 +-------------------+    |                           v                            
     .---------.          |                         +---+---+---+---+              
-   (   after   )         |                         | 4 | 5 | 9 | 4 |              
+   (   after   )         |                         | 4 | 5 | 9 |*4 |              
     `---------'          |                         +---+---+---+---+              
                          |                                       |                
                          |                                       +-------------+  
                          |                                                     v  
                          |                                       +---+---+---+---+
-                         |                                       | 6 | 6 | 6 | 5 |
+                         |                                       | 6 | 6 | 6 |*5 |
                          |                                       +---+---+---+---+
                          |                                                        
                          v