Codeforces contest problem

#1

https://codeforces.com/contest/1491/problem/A

please help me to understand this problem.I have seen its hints and solutions but I am still unable how thre input and output is coming.please explain

#2

hello @Somasree
note following things.
a) all elements of array are either 0 or 1.
b) a[x]=1-a[x] . this is nothing but flipping 0 with 1 and 1 with 0.
c) answer will either be 0 or 1. becuase we are only flipping the array values(0->1 or 1->0)

now ->
u simply have to keep track of count of zero and ones.
if count of ones >= k then answer will be 1
otherwise 0.

#3

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