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8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]
+er = num_list[3]
+t=0
+y=9
+mid=(y-t)//2
+
+if num_list[mid]==er:
+    print("找到了")
+elif num_list[mid]<er:
+    t = mid + 1
+    print(mid)
+elif num_list[mid]>er:
+    y = mid - 1
+    print(mid)
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