class Pair

class Pair{ int a; int b; public Pair(int x,int y){ a=x; b=y; } @Override public boolean equals(Object o) { if (o instanceof Pair) { Pair p = (Pair)o; return p.a == a && p.b == b; } return false; } @Override public int hashCode(){ return new Integer(a).hashCode() * 31 + new Integer(b).hashCode();

    }
}

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