How to store list of contacts in Salesforce associated to a particular account using Map?

Hi subramanyam,

Use below code, it will provide you a map of Account vs list of associated contacts.

map<Account,list<Contact>> mapOfAccountVsContact = new map<Account,list<Contact>>();
for(Account accObj : [select id, name, (select id,lastname from contacts) from Account]){
mapOfAccountVsContact.put(accObj,accObj.Contacts);
}
system.debug('mapOfAccountVsContact::'+mapOfAccountVsContact);