If 70% or more of the Contacts on an Account are Dead, mark the need_intel field to TRUE

TriggerExample 5

public static void DeadIntel(list<Contact> cont){
        Set<Id> accIds = new Set<Id>();
        for(Contact conList : cont){
            if(conList.accountId!=null){
                accIds.add(conList.accountId);    
            }
            
        }
        
        Map<Id, List<Contact>> accContactMap = new Map<Id, List<Contact>>();
        List<Account> accUpdateList = new List<Account>();
        for(Contact obj : [SELECT accountId,Dead__c
                           FROM Contact
                           WHERE accountId IN :accIds]){
                               
                               List<Contact> contLists;
                               if(accContactMap.containsKey(obj.accountId)){
                                   contLists = accContactMap.get(obj.accountId);
                               }else{
                                   contLists = new List<Contact>();
                               }
                               contLists.add(obj);
                               accContactMap.put(obj.accountId, contLists);
                           }
        for(Id accId : accContactMap.keySet()){
            Integer count_of_Dead = 0;
            Integer total_con = accContactMap.get(accId).size();
            if(accContactMap.get(accId).size() > 1){              
                for(integer i =0 ; i<accContactMap.get(accId).size(); i++)
                    if(accContactMap.get(accId)[i].Dead__c == true){
                        count_of_Dead++;
                    }
            }
            if((count_of_Dead*100)/total_con) > 70)
                accUpdateList.add(new Account(id = accId, needintel__c = true));   
        }   
        if(!accUpdateList.isEmpty()){
            update accUpdateList;
        }
    }
//Trigger
trigger UpdateContact on Contact (after update) {
if(Trigger.isUpdate && Trigger.isAfter){
        AccountContact.DeadIntel(Trigger.new);
    }
}