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N/3 Repeat Number

You’re given a read only array of n integers. Find out if any integer occurs more than n/3 times in the array in linear time and constant additional space.

If so, return the integer. If not, return -1.

If there are multiple solutions, return any one.

Example :

Input : [1 2 3 1 1]
Output : 1 
1 occurs 3 times which is more than 5/3 times. 
NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a doubt? Checkout Sample Codes for more details.
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