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]
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+low = 0
\ No newline at end of file
+high = len(num_list)-1
+mid = (low+high)//2
+while low<high:
+    mid = (low+high)//2
+    if num_list[mid]==9:
+        print(mid)
+        exit()
+    if num_list[mid]<9:
+        low=mid+1
+    if num_list[mid]>9:
+        high=mid-1
+print("傻逼，没有9")
+low = 0
+high = len(num_list)-1
+mid = (low+high)//2
+while low<high:
+    mid = (low+high)//2
+    if num_list[mid]==20:
+        print("20的索引是8")
+        exit()
+    if num_list[mid]<20:
+        low=mid+1
+    if num_list[mid]>20:
+        high=mid-1
\ No newline at end of file