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public static int hourglassSum(List> arr) { int row = arr.size(); int col = arr.get(0).size();
int maxSum = Integer.MIN_VALUE; for(int i=0;i<=row - 3;i++){ for(int j=0;j<=col-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); if(sum>maxSum){ maxSum = sum; } } } return maxSum;
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2D Array - DS
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public static int hourglassSum(List> arr) { int row = arr.size(); int col = arr.get(0).size();
}