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]
+num1=9
+num2=20
+low=0
+low2=0
+high=9
+high2=9
+mid=low+high//2
+mid2=low2+high2//2
+while True:
+    if num_list[mid]==num1:
+        print(mid)
+        break
+    if num_list[mid]<num1:
+        high=mid-1
+        mid=low+high//2
+    elif num_list[mid]>num1:
+        low=mid+1
+        mid=low+high//2
+while True:
+    if num_list[mid2]==num2:
+        print(mid2)
+        break
+    if num_list[mid2]<num2:
+        high2=mid2-1
+        mid2=low2+high2//2
+    elif num_list[mid]>num2:
+        low2=mid2+1
+        mid2=low2+high2//2
+