There are 100 pieces of sugar. One for the first time and two for the second time. How many times can you add one more piece of sugar to each time? The main question is how to calculate?

First 1 second 2 nth n
Then the number of candies used after n times is 1 + 2 + 3 + +N
==(1+n)n/2
14 is 105, 13 is 91
So by the time we hit 13, there were nine left, and you were left
It's up to you
I'll tell you how to finish it 10 times

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