我正在寻找一种算法来解决一个问题,在该算法中我维护一个树结构,我需要在该结构上找到数据节点的最接近匹配。如果没有完全匹配,则回退到最接近的前缀。
例如,如果说我有以下结构,其中单词(单词中的数字)是分支,带方括号的数字是数据(叶节点);我正在寻找一种算法,该算法将返回下表所示的一组结果。请注意,路径分隔符是">"
one - [1]
/\
two five
/\ \
eight [12] nine
/ \
[128] [159]
+---------------------------+--------+---------------------------------------------+
| path | result | |
+---------------------------+--------+---------------------------------------------+
| one > five > nine | 159 | whole path matches |
| one > five | 1 | partial (only "one" matched) |
| one > two > eight | 128 | whole path matches |
| one > two | 12 | whole path matches |
| one > two > eight > seven | 128 | partial (only "one > two > eight" matched) |
| one > two > seven | 12 | partial (only "one > two" matched) |
+---------------------------+--------+---------------------------------------------+
我真的很喜欢 C++(STL
或boost
基于)的库;但是为此目的仅指向一个漂亮的算法也同样好。