Unable to understand explanation

#1

i am unable to grasp the explanation of this hint… please help me and also i have posted a query regarding my method for the same . pls answer that

#2

Hey @Shobhit_kumar
Basically, There are some pairs given to you. Pairs may/may not contain same element.(Don’t get confused because of “shoes”)
You have to select one element from each pair.
Sum of all elements you pick should be odd.
For given test case,these are possible:
1+3 (even,invalid)
1+4 (odd,valid)
2+3 (odd,valid)
2+4 (even,invalid)
Hence answer is 2.

#3

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