save project

binary_search.py

 # 使用二分查找法，找出9和20在列表里面的索引
 # 使用二分查找法，找出9和20在列表里面的索引
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
 num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num=9
+low=0
+high=len(num_list)-1
+guess=0
+mid=0
+while True:
+    
+    mid=(low+high)//2
+    guess==num_list[mid]
+    if low<high:
+        if guess==num:
+            print("找到了")
+            break
+        elif guess<num:
+            low=mid+1
+        elif guess>num:
+            high=mid-1
+    else:
+        print("没找到")
+        break
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+num=20
+low=0
+high=len(num_list)-1
+guess=0
+mid=0
+while True:
+    
+    mid=(low+high)//2
+    guess==num_list[mid]
+    if low<high:
+        if guess==num:
+            print("找到了")
+            break
+        elif guess<num:
+            low=mid+1
+        elif guess>num:
+            high=mid-1
+    else:
+        print("没找到")
+        break
+        
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