Doubt regarding initializing dp array

#1

i defined the dp array inside the robotpath function which was defined and then defined in the main as " INT DP[1001][1001]={0};" then it gave me the output as 10
But when i used memset function in the main like in the video and defined dp array as global then the ans came correct as 2.
I want to ask why is that so?

#2

A “zero” in a floating point variable is not necessarily the same as
“all bits zero”. ‘memset’ clears all bits. and therefore use of memset is recommended

#3

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