Duplicate in array You are given an array ‘ARR’ of size ‘N’ containing each number between 1 and ‘N’ - 1 at least once. There is a single integer value that is present in the array twice. Your task is to find the duplicate integer value present in the array. For example: Consider ARR = [1, 2, 3, 4, 4], the duplicate in...
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Brute ForceA simple method is to traverse through the array ARR to find the frequency of each number in the given array, and we will check if the frequency of the number is more than 1. Therefore...
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CodingNinjas
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Dynamic ProgrammingThe idea is to observe the fact that all array elements contain a value between 1 to N - 1. Our approach will be to construct an array to store the frequency of each element in the ...
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CodingNinjas
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Floyd’s cycle finding algorithmThe idea is to maintain two pointers, fast and slow. The pointer slow goes forward one step, and the pointer fast goes forward two steps each time. The two pointers meet...
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