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
+r=20
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+q=0
+w=len(num_list)-1
+while q<=w:
+    e=(q+w)//2
+    t=num_list [e]
+    if r==t:
+        print(1)
+        break
+    elif t<r:
+        q=e+1
+    elif t>r:
+        e=t-1
+