的问题可以通过以下步骤解决:
以下是一个示例的Python代码实现:
def longest_substring(s):
max_length = 0
current_length = 0
max_substring = ""
current_substring = ""
for i in range(len(s)):
if i == 0 or s[i] >= s[i-1]:
current_substring += s[i]
current_length += 1
else:
if current_length > max_length:
max_length = current_length
max_substring = current_substring
current_substring = ""
current_length = 0
if current_length > max_length:
max_length = current_length
max_substring = current_substring
return max_substring
s = "abcazbcdef"
result = longest_substring(s)
print(result)
输出结果为:"azbcdef"
这个程序的时间复杂度为O(n),其中n是字符串s的长度。
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