/in/foo.cc: In function 'void dfs1(int)':
/in/foo.cc:30:6: warning: unused variable 'rec' [-Wunused-variable]
  int rec=0; mx[x]=dep[x];
      ^~~
/in/foo.cc: In function 'int get_up(int, int)':
/in/foo.cc:56:2: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
  if (k==r) return x; k-=r;
  ^~
/in/foo.cc:56:22: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
  if (k==r) return x; k-=r;
                      ^