/in/foo.cc: In function 'int main()':
/in/foo.cc:141:40: warning: unused variable 'pe' [-Wunused-variable]
  141 |                 edgenode edge[maxM], * pe = edge, * link[maxN], * pre[maxN], * cur[maxN];
      |                                        ^~
/in/foo.cc:141:53: warning: unused variable 'link' [-Wunused-variable]
  141 |                 edgenode edge[maxM], * pe = edge, * link[maxN], * pre[maxN], * cur[maxN];
      |                                                     ^~~~
/in/foo.cc:141:67: warning: unused variable 'pre' [-Wunused-variable]
  141 |                 edgenode edge[maxM], * pe = edge, * link[maxN], * pre[maxN], * cur[maxN];
      |                                                                   ^~~
/in/foo.cc:141:80: warning: unused variable 'cur' [-Wunused-variable]
  141 |                 edgenode edge[maxM], * pe = edge, * link[maxN], * pre[maxN], * cur[maxN];
      |                                                                                ^~~