Not able to understand this problem

#1

The explanation of the video is not clear to me. can you explain what we are doing in this problem.

#2

@1shubhamjoshi1 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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