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  1. Sales by Match
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Sales by Match

  • outsider973
     + 0 comments
       public static int sockMerchant(int n, List<Integer> ar) {
    // Write your code here
        var set = new HashSet<>();
        var numberPairs = 0;
        
        for (int sock : ar) {
            if (!set.add(sock)) {
                set.remove(sock);
                numberPairs++;
            }
        }
        return numberPairs;

    }