general_assert(iter->second > 0, "Reference sequence name " + cstrtos(target_name[i]) + " is duplicated!");
e2i[i + 1] = iter->second;
i2e[iter->second] = i + 1;
general_assert(iter->second > 0, "Reference sequence name " + cstrtos(target_name[i]) + " is duplicated!");
e2i[i + 1] = iter->second;
i2e[iter->second] = i + 1;