You are given an array a containing a list of strings. Your task is to construct an array of the same length, where the iᵗʰ element is a 2-character string formed by the first character of a[i] concatenated with the last character of a[i + 1].
If there is no a[i + 1], cycle back to the beginning of the array. In other words, for the final element, concatenate the first character of a[a.length - 1] with the last character of a[0].
Return the resulting array of 2-character strings.
Note: You are not expected to provide the most optimal solution, but a solution with time complexity not worse than O(a.length × sum(a[i].length)) will fit within the execution time limit.
Example
- For a = ["cat", "dog", "ferret", "scorpion"], the output should be
solution(a) = ["cg", "dt", "fn", "sp"]
Imagine that you are going fishing at the local pond. The size of the bait must be strictly smaller than the size of the fish for it to catch. Once the fish is caught, it is removed from the pond and cannot be caught again. However, each bait can be used up to 3 times before depletion.
Given two arrays of fish and baits, where fish[i] corresponds to the size of the iᵗʰ fish in the pond, and baits[j] is the size of the jᵗʰ bait, your task is to return the maximum number of fish you can catch from the pond with the given baits.
To compute the answer, you need to use each bait to its possible extent, going from the largest bait to the smallest bait. Use each bait to catch the largest fish remaining in the pond and move to the next bait if the current bait was used three times or if it is not strictly smaller than the largest remaining fish. When you run out of baits, return the number of caught fish.
Note: You are not expected to provide the most optimal solution, but a solution with time complexity not worse than O(n log n) will fit within the execution time limit.
Think about a team chat with numerous users writing messages in it. The chat supports two types of actions:
- "MESSAGE" - Messages a set of users. The format looks as follows:
["MESSAGE", <timestamp>, "<mentions>"].
Mentions string can contain the following space-separated tokens:id<number>, where<number>is an integer in range[1:999]- mentioning of individual users@HERE- mentioning active users
- "OFFLINE" - Makes a user with a given id inactive for 60 time ticks - the user will be active again at time
<timestamp> + 60. It is guaranteed that the user with given<id>will be active when this action is applied. The format looks as follows:["OFFLINE", <timestamp>, "<id>"], where id is a single individual mention.
Note: All the events are sorted by their timestamp.
Imagine a group of young engineers trying to solve a puzzle involving sequences of lights on a giant circuit board. Each light sequence is represented by a non-negative integer, where reversing the digits in the integer represents reversing the light sequence. The reversal process flipDigits involves flipping the order of the digits and removing any leading zeroes from the result.
For instance:
- flipDigits(5070) = 705
- flipDigits(80) = 8
- flipDigits(123) = 321
Some special pairs of light sequences can be combined in a unique way that makes them equivalent, no matter which sequence starts the combination.
Given an array of non-negative integers arr, the engineers need to calculate how many pairs (i, j) exist such that i ≤ j and
arr[i] + flipDigits(arr[j]) = arr[j] + flipDigits(arr[i]).
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