update list&tree

2 List/QPS Counter.md

@@ -5,3 +5,35 @@
 
 
 
+
+```Java
+	static AtomicInteger qpsCount = 100; //线程安全
+    static volatile long lastSenconds =  System.currentTimeMillis()/1000;
+    
+    //1 计数器 
+    public static boolean tryAcquire() {
+
+        long current = System.currentTimeMillis()/1000;
+        if(current == lastSenconds){
+            
+            if (qpsCount-- > 0) {//CAS api
+                return true;
+            } else {
+                //限流
+                return false;
+            }
+            
+        } else{//下一个时间窗口
+            lastSenconds = current;
+            qpsCount = 100;
+            return true;
+        }   
+    }
+```
+
+
+
+
+
+
+

2 List/数组.md

@@ -18,7 +18,6 @@
 
 
 
-
 数据结构
 
 ```