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C#
int leftRightSum = 0; int rightLeftSum = 0;
for (int i = 0; i < arr.Count; i++) { leftRightSum += arr[i][i]; } for (int i = arr.Count-1; i > -1; i--) { rightLeftSum += arr[i][arr.Count-1-i]; } int difference = Math.Abs(leftRightSum - rightLeftSum); return difference;
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Diagonal Difference
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C#