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]
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+bingo_num=20# 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]
+low = 0
+high = len(num_list)-1
+
+while low <= high:
+    mid = (low+high)//2
+    guess_num = num_list[mid]
+    if guess_num == bingo_num:
+        print("找到了，它的索引是",mid)
+        break
+    elif guess_num<bingo_num:
+        low = mid+1
+    elif guess_num>bingo_num:
+        high = mid+1
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