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
+low = 0
+high = 9
+while True:
+    num = 9
+    mid = (low+high)//2
+    guess = num_list[mid]
+    if guess == num:
+        print('找到9了：'+str(mid))
+        break
+    elif guess > num:
+        high = mid-1
+    else:
+        low = mid+1
+    if low>high:
+        print('找不到9')
+        break
+low = 0
+high = 9
+while True:
+    num = 20
+    mid = (low+high)//2
+    guess = num_list[mid]
+    if guess == num:
+        print('找到20了：'+str(mid))
+        break
+    elif guess > num:
+        high = mid-1
+    else:
+        low = mid+1
+    if low>high:
+        print('找不到20')
+        break
+