You are given an array A of n distinct integers , expressed in binary.
Each integer is in the range [0,n] .As there are n+1 values in this
range, there is exactly one number missing .As a single operation, you
may access the jth integer(A[i][j]) . Note that it would take O(nlogn)
time to read the full array.

   Give an O(n) algorithm to determine which integer is missing , and
justify its correctness, You may assume that n = 2^k - 1 for some
integer k.

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