/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:33:53: error: expected primary-expression before ']' token
 f[u][k+i] = max(f[u][k+i], f[j][i] + f[u][k] + dist[] * ((LL)i * (K - i) + ((LL)siz[j] - i) * (n - K - siz[j] + i)));
                                                     ^