%%輸入數據
%?zhilu=[
%?????1?2???;
%?????1?6???;
%?????1?7???;
%?????2?3???;
%?????2?8???;
%?????3?4???;
%?????3?9???;
%?????4?5???;
%?????4?10??;
%?????5?6???;
%?????5?11??;
%?????6?12??;
%?????7?8???;
%?????7?12??;
%?????8?9???;
%?????9?10??;
%?????10?11?;
%?????11?12?;?
%????];
zhilu1=[?
????0?3?;
????1?2?;
????2?3?;
????2?4?;
????3?5?;
????5?7?;
????5?9?;
????7?6?;
????9?8?
????];

%%將輸入支路矩陣轉化為鄰接矩陣
[m1n1]=size（zhilu1）;
zhilu=zhilu1+ones（m1n1）;
n=max（max（zhilu（:1:2）））;?????????????????%獲取支路節點數
G=zeros（n）;???????
for?i=1:m1
??m2=zhilu（i1）;
??n2=zhilu（i2）;
??G（m2n2）=1;
??G（n2m2）=1;
end
%%尋找與第一個頂點相關聯的頂點
W=zeros（1n）;????????????????????????????%儲存標號后的節點，節點順序從小到大排列
l=0;
v=1;
a1=find（G（v:）==1）;??????????????????????%尋找與第