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]
\ No newline at end of file
+num=9
+num2=20
+a=0
+b=len(num_list)
+while b<a:
+    c=(a+b)//2
+    d=num_list[c]
+    if d>num2:
+        a=c-1
+    elif d<num2:
+        a=c+1
+    elif d==num2:
+        print('ok')
+        break
+        
+
+

s.py

+# 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=20
+low=0
+high=len(num_list)-1
+while low<=high:
+    mid=(low+high)//2
+    guess=num_list[mid]
+    if guess==num:
+        print('ok',mid)
+        break
+    elif guess<num:
+        low=mid+1
+    elif guess>num:
+        low=mid-1
+