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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+find_num = 11
+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 == find_num:
+        print("找到了！它的索引是：",mid)
+        break
+    elif guess_num < find_num:
+        low = mid = 1
+    else:
+        high = mid - 1
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