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Java 15 solution:
public static int hourglassSum(List<List<Integer>> arr) { // Write your code here int maxSum = Integer.MIN_VALUE; for (int i = 0; i <= 3; i++) { for (int j = 0; j <= 3; j++) { int sum = arr.get(i).get(j) + arr.get(i).get(j + 1) + arr.get(i).get(j + 2) + arr.get(i + 1).get(j + 1) + arr.get(i + 2).get(j) + arr.get(i + 2).get(j + 1) + arr.get(i + 2).get(j + 2); maxSum = Math.max(maxSum, sum); } } return maxSum; }
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2D Array - DS
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Java 15 solution: