public class ConvertingLeads {
    @InvocableMethod
    public static void assignLeads(List<Id>LeadIds){
        LeadStatus cLeadStatus=[Select Id,MasterLabel from LeadStatus where isConverted=true limit 1];
        List <lead> massLeadConvert=new List<lead>();
        List<Database.LeadConvert> dl=new List<Database.LeadConvert>();
        for(Id currentLead:LeadIds){
            Database.LeadConvert LeadConvert=new Database.LeadConvert();
            LeadConvert.setLeadId(currentLead);
            LeadConvert.setConvertedStatus(cLeadStatus.MasterLabel);
            LeadConvert.setDoNotCreateOpportunity(False);
            dl.add(LeadConvert); 
        }
        if(!dl.isEmpty()){
            List <Database.LeadConvertResult>lcr=Database.convertLead(dl); 
        }
        
    }
    
}