/in/foo.cc: In function 'void spfa()':
/in/foo.cc:30:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=n;i++) dis[i]=1000000000;dis[1]=0;
  ^~~
/in/foo.cc:30:42: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  for(int i=1;i<=n;i++) dis[i]=1000000000;dis[1]=0;
                                          ^~~
/in/foo.cc:34:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   for(int i=head[now];i;i=e[i].nxt)
   ^~~
/in/foo.cc:41:4: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
    vis[now]=0;
    ^~~