About Indexing going negative

#1

In the statement: currentSum = cumSum[ j ] - cumSum[ i-1 ]

When i would be zero, cumSum[ i-1 ] would become cumSum[ -1 ], And it still works?

How ?
should not it be a segmentation fault

#2

Negative indexing in cpp Refer this

#3

Thank You so much for the assistance ! @pratyush63

#4

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