TLE when using java 8 lambda, any better solution?

  • 0

    Hashmap solutions are trivial. I tried to solve it using java 8 lambda but can't get an O(n) solution, below O(n2) one got TLE. Do you have any better idea?

    public boolean containsNearbyDuplicate(int[] a, int k) {
    		if (a == null) {
    			return false;
    		int n = a.length;
    		return IntStream.range(0, n).
    						i -> IntStream.range(i+1, n).anyMatch(
    								j -> a[i] == a[j] && j - i <= k));

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