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
+l=0
+h=9
+while h>l:
+    m=(l+h)//2
+    guess=num_list[m]
+    if guess<9:
+        l=m+1
+    elif guess==9:
+        print(m)
+        break
+    else:
+        h=m-1
+if h<=l:
+    print("无")
+l=0
+h=9
+while h>l:
+    m=(l+h)//2
+    guess=num_list[m]
+    if guess<20:
+        l=m+1
+    elif guess==20:
+        print(m)
+        break
+    else:
+        h=m-1
\ No newline at end of file