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You can't set the initial value of 'total' to 0, because the answer might be lower. To avoid that, set the initial value to the lowest possible (-infinity).
The smallest number allowable for any of the numbers in the hourglass is -9. If all the numbers in an hourglass are -9, the lowest possible value for an hourglass is -63. So an initial value of -63 is ok too.
2D Array - DS
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You can't set the initial value of 'total' to 0, because the answer might be lower. To avoid that, set the initial value to the lowest possible (-infinity).
The smallest number allowable for any of the numbers in the hourglass is -9. If all the numbers in an hourglass are -9, the lowest possible value for an hourglass is -63. So an initial value of -63 is ok too.