/in/foo.cc: In function 'void init_lca()':
/in/foo.cc:53:9: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
         if (top[i] ^ i) continue ; int Len = mxd[i] - dep[i];
         ^~
/in/foo.cc:53:36: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
         if (top[i] ^ i) continue ; int Len = mxd[i] - dep[i];
                                    ^~~
/in/foo.cc: In function 'int query(int, int)':
/in/foo.cc:68:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if (k - dep[u] + dep[top[u]] >= Up[top[u]].size()) return 0; 
             ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~