@^^ many solution to this problem in O(n)
METHOD 1(Use sum formula)
Algorithm:
1. Get the sum of numbers
total = n*(n+1)/2
2 Subtract all the numbers from sum and
you will get the missing number.
Time Complexity: O(n)
METHOD 2(Use XOR)
1) XOR all the array elements, let the result of XOR be X1.
2) XOR all numbers from 1 to n, let XOR be X2.
3) XOR of X1 and X2 gives the missing number.
Time Complexity: O(n)
Correct me If I am Wrong
Thanks & Regards
Shashank Mani >> ""The best way to escape from a problem is to solve
it.""
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