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I'm a bit confused between subarray, subsequence & subset
if I have {1,2,3,4}
then
subsequence can be {1,2,4} OR {2,4} etc. So basically I can omit some elements but keep the order.
subarray would be( say subarray of size 3)
{1,2,3} {2,3,4} Then what would be the subset?
I'm bit confused between these 3.
840
A Substring takes out characters from a string placed between two specified indices in a continuous order. On the other hand, subsequence can be derived from another sequence by deleting some or none of the elements in between but always maintaining the relative order of elements in the original sequence.
The actual definition of contiguous subarray (as others have answered) is any sub series of elements in a given array that are contiguous ie their indices are continuous. So given [1,2,3,4,5,6]: [1,2,3], [3,4], [3,4,5,6] are all valid contiguous subarrays. Any algorithm can be used to generate the subarrays.
A subarray is commonly defined as a part or section of an array. An array is a set of variables that a programmer defines collectively. Instead of creating separate variables, the programmer can declare a single array with multiple values labeled.
A substring is exactly the same thing as a subarray but in the context of strings. For instance, the substrings of the string "ara" would be "a" , "r" , "ar" , "ra" , "ara" , "" . Things to note: A substring is just a subarray that is made up of only characters.
In my opinion, if the given pattern is array, the so called subarray means contiguous subsequence.
For example, if given {1, 2, 3, 4}, subarray can be
{1, 2, 3} {2, 3, 4} etc. While the given pattern is a sequence, subsequence contain elements whose subscripts are increasing in the original sequence.
For example, also {1, 2, 3, 4}, subsequence can be
{1, 3} {1，4} etc. While the given pattern is a set, subset contain any possible combinations of original set.
For example, {1, 2, 3, 4}, subset can be
{1} {2} {3} {4} {1, 2} {1, 3} {1, 4} {2, 3} etc. Consider an array:
{1,2,3,4} Subarray: contiguous sequence in an array i.e.
{1,2},{1,2,3} Subsequence: Need not to be contiguous, but maintains order i.e.
{1,2,4} Subset: Same as subsequence except it has empty set i.e.
{1,3},{} Given an array/sequence of size n, possible
Subarray = n*(n+1)/2 Subseqeunce = (2^n) -1 (non-empty subsequences) Subset = 2^n If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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