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Find The Missing Duplicate in a Given Array.

Objec­tive: - Given an Inte­ger array. Array con­tains dupli­cates of all the num­bers in array except one num­ber . Find that number.

Exam­ple :

int [] A = { 2,1,3,5,5,3,2,1,6,7,7,8,8};
Output : Missing duplicate is 6


  • Naive solu­tion is use Hash Table com­plex­ity — O(n)
  • Bet­ter solu­tion - XOR
  • A^A = 0 and A^B^A = B, so if we XOR all the ele­ments, answer will be the miss­ing no
  • If we have only one ele­ment, the miss­ing no will be that no



Missing duplicate is 6

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  • anchal dhi­man

    Nice One