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
+l = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+def find(d,a,b):
+    c = (a+b)//2
+    if l[c] == d:
+        print('找到了')
+        return
+    elif l[c] < d:
+        a = c+1
+        find(d,a,b)
+    elif l[c] < d:
+        b = c-1
+        find(d,a,b)
+    else:
+        print('查无此数')
+        return
+find(10,0,9)
+
+