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2 years ago
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In order to generate a Spiral Order Matrix with given integer A. We need to declare one ArrayList and Initialize it. I have done it like below. ArrayList<ArrayList<Integer>> spiralMatrix = new ArrayList<ArrayList<Integer>>(); for(int i=0;i<A;i++) { spiralMatrix.add(new ArrayList<Integer>()); for(int j=0;j<A;j++) { spiralMatrix.get(i).add(0); } } Is there any alternative way? because we are wasting O(N^2) for Initializing