how to display account related contacts using pageblock and apex controller class.can any one give me the code plz.?

VFP

<apex:page controller="ContactsVisualforceController" standardStylesheets="false">
    <apex:pageBlock >
        <apex:repeat value="{!displayAccounts}" var="acc">
            <dl>
                <dt>Account Name:</dt>
                <dd><apex:outputText value="{!acc.Name}"/></dd> 
            </dl>
            <dl><dt>Contacts:</dt></dl>
            <apex:repeat value="{!acc.Contacts}" var="cont">
                <dl>
                    <dd><apex:outputText value="{!cont.Name}"/></dd>
                </dl>
            </apex:repeat>    
        </apex:repeat>
    </apex:pageBlock>
</apex:page>

Controller :

public with sharing class ContactsVisualforceController {
    public list<Account> displayAccounts {get; set;}
    public ContactsVisualforceController(){
        displayAccounts = [select id,name,(select id,name from Contacts) from Account];
    }
}