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]
+a = 20
\ No newline at end of file
+num_list = [1, 3, 5, 8, 11, 15, 17, 18, 20, 21]
+x = 0
+g = len(num_list) - 1
+while  x <= g:
+    zj = (x + g) // 2
+    cds = num_list[zj]
+    if cds == a:
+        print('tashi',zj)
+        break
+    elif cds < a:
+        x = zj + 1
+    elif cds > a:
+        x = zj - 1
\ No newline at end of file