string index out of range
时间: 2023-08-27 07:10:12 浏览: 51
抱歉,这个错误可能是由于在字符串索引超出范围时引起的。在编写LZ77编码算法时,需要确保所有的字符串索引都在有效范围内。以下是一个修改后的实现示例,添加了对索引的有效性检查:
```python
def lz77_encode(input_str, window_size, max_length):
encoded_str = []
window_start = 0
while window_start < len(input_str):
search_window = input_str[max(0, window_start - window_size):window_start]
longest_match_length = 0
longest_match_offset = 0
for offset in range(1, min(window_size, len(input_str) - window_start + 1)):
match_length = 0
while match_length < max_length and window_start + match_length < len(input_str) and input_str[window_start + match_length] == input_str[window_start - offset + match_length]:
match_length += 1
if match_length > longest_match_length:
longest_match_length = match_length
longest_match_offset = offset
if longest_match_length == 0:
encoded_str.append((0, 0, input_str[window_start]))
window_start += 1
else:
encoded_str.append((longest_match_offset, longest_match_length, input_str[window_start + longest_match_length]))
window_start += longest_match_length + 1
return encoded_str
```
请确保在调用 `lz77_encode` 函数时,传递给它的输入字符串没有超出索引范围。如果仍然遇到问题,请提供更多的代码和详细信息,我将尽力帮助你解决问题。