View Compilation Error

0_0_39565216_20972.cpp: In function 'void Dfs1(long long int)':
0_0_39565216_20972.cpp:25:28: error: 'mu' was not declared in this scope; did you mean 'u'?
   25 |         mn[u] = min(mn[u], mu[v]);
      |                            ^~
      |                            u