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Simple solution using hashMap data structure in java.
publicstaticintsockMerchant(intn,List<Integer>ar){// Write your code hereintcount=0;HashMap<Integer,Integer>hMap=newHashMap<>();for(Integerele:ar){if(hMap.containsKey(ele)){intfreq=hMap.get(ele);freq++;hMap.put(ele,freq);if(freq%2==0)count++;}else{hMap.put(ele,1);}}returncount;}
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Simple solution using hashMap data structure in java.