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
-num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+l=0
+r=len(num_list)-1
+goal=20
+
+while l<=r:
+    mid=(l+r)//2
+    guess=num_list[mid]
+    if guess==goal:
+        print("找到了在"+str(mid))
+        exit()
+    elif guess<goal:
+        l=mid+1
+    else:
+        l=mid-1   
+print("没找到")        
\ No newline at end of file