/in/foo.cc: In function 'int lca(int, int)':
/in/foo.cc:24:4: warning: this 'if' clause does not guard... [-Wmisleading-indentation]
    if (deep[x]<deep[y])  swap(x,y);int t=deep[x]-deep[y];
    ^~
/in/foo.cc:24:36: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'if'
    if (deep[x]<deep[y])  swap(x,y);int t=deep[x]-deep[y];
                                    ^~~

ValueError('not enough values to unpack (expected 4, got 0)',)