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Questions tagged [interval]

For code using intervals to measure “distance” between values, possibly as input, output, or in method calls.

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Performance issue with empty lists

Here's my updated version of the problem I posted at Calculating time windows for entities, adding in suggested changes as well as a change I did so that the Reflection is 'cached' in a ...
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3answers
300 views

Calculating time windows for entities

I have made some code that operates on multiple entities and creates 'time windows' for them. Basically, the entities will contain states, usually in boolean or int. They will be timestamped and in ...
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2answers
58 views

Iterating over a range of integer ranges in Java

My use case is this: RangeDemo.java: ...
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2answers
278 views

Coding Challenge Solution - Good Range

This my solution to this Good Range Coding Challenge There is a number space given from 1 to N. And there are M queries followed by that. In each query, we were given a number between 1 to N (both ...
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1answer
42 views

Python function to get numbers around another number

I made a function to get a list with numbers around another number. Example: I want to get in a range of 2 numbers around 4. This will return: [2, 6]. You can set a ...
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0answers
16 views

Construct intervals from a sequence of numbers and vice versa

What is a Pythonic way to construct intervals from a sequence of integer numbers? E.g. sequence [1, 2, 3, 6, 7, 9] could be converted to ...
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2answers
283 views

How to set an interval to std::map [closed]

This code belongs to a contest. I tried to apply the range of data to a std::map. The contest system however warns me that the implementation of the assign function ...
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3answers
160 views

Get consecutive integer number ranges from list of int

This is an algorithm to return a list of consecutive integer ranges from a list of integers. The practical use of such an algorithm is to filter lists more efficiently, i.e. rather than check e.g. ...
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0answers
24 views

Getting service rate based on time/day of service

I have a long roster where I'd like to categorize the rates by time/day of service. Most shifts ends the same date but there are some special cases where the shift ends on a different date. I have to ...
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2answers
316 views

Finding all intervals that match predicate in vector

I have a function find_all_intervals_below that iterates through a vector and finds all the index intervals of at least a given length where each element within the ...
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3answers
323 views

Collect subsequences of consecutive integers

I've written a function to split a list into several lists with consecutive integers, e.g.: extract_subsequences([1,2,3,7,8,9]) ...
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0answers
35 views

Laravel working with dynamic start and end dates to grab some data

So, to start off, the below code does work, but it feels like a newbie solution to me, and if I ever need to come back to this code, I will have no idea what I was thinking. I have a table called <...
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2answers
51 views

Python Float point range() operator implementation

I recently wrote a full implementation of a range() operator with floating point values in Python, and I'm not sure if I've followed the standard pythonic patterns. ...
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3answers
4k views

Checking if two time intervals overlap

I have two time intervals i1 and i2, each defined by two values, begin and ...
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1answer
248 views

Counting integers that are within intervals

I am looking for a more efficient way than bruteforcing my way through in the following problem in python 3. Problem statement: Input: An array of n integers, scores, where each score is denoted by ...
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2answers
925 views

Find the intervals which have a non-empty intersection with a given interval

The problem is the following: I have a list intervals which consists of tuples of the form (start, end) [with ...
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4answers
146 views

Add dash between more than two consecutive numbers and comma between other numbers in array

I have an ordered array of integer values: 10, 11, 12, 13, 15, 16, 19 and I need to write a dash between first and last consecutive values when there are more than two consecutive values (10-13). ...
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1answer
117 views

Calculate the intersections of opening hours

I have a solution but it feels bloated and unclean. How can I clean it up? The second for loop especially does not feel right. I'm trying to calculate the opening ...
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0answers
92 views

PostgreSQL: maintaining non-overlapping temporal ranges

I have to store some temporal meta data used primarily in bulk processing of a time-series (sensor measurements). Each value of this meta data is valid for a potentially half-open range of time. ...
2
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1answer
359 views

Merge a new interval into given array of intervals

This is Merge Intervals problem from www.interviewbit.com Problem : Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary). You may assume that ...
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3answers
841 views

Hackerrank challenge - Apple and Orange

The problem I am trying to solve is this. Apples fall at various offsets relative to an apple tree at position a, and oranges fall at various given offsets relative to an orange tree at position b. ...
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3answers
387 views

Merge intervals

Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,10],[15,18], return [1,6],[8,10],[15,18]. GitHub ...
3
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3answers
217 views

Intersection of the interval set

Recently I had an interview where it was asked: Given a list of people with their birth and end years find the year with the most number of people alive. I implemented in Java and was trying to find ...
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2answers
836 views

Traffic speed limit check for intervals

Given 2 lists of tuples limits and speeds, both have the format of [(speed1, time1), (speed2, time2)]. My goal is to write a ...
2
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1answer
298 views

Return the optimal time slot

Implement a function meetingPlanner that given the availability, slotsA and slotsB, of two people and a meeting duration dur, returns the earliest time slot that works for both of them and is of ...
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Box partitioning with arrays of boost::intervals

I need to write a function that takes a box in space, represented as an std::vector of boost::intervals, and split it into several smaller boxes. First, for convenience, I made some definitions <...
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1answer
174 views

Finding the longest overlapping period

I have a list of records containing Id, DateFrom, DateTo. For the sake of this question we can use this one: ...
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5answers
2k views

Flipping coins performance

This is the Flipping coins problem on CodeChef: There are \$N\$ coins kept on the table, numbered from \$0\$ to \$N - 1\$. Initially, each coin is kept tails up. You have to perform two types of ...
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1answer
66 views

Searching and sorting ranges in excel with toggle buttons

I have a spreadsheet containing ±100 named ranges (5 rows, 15 colums) which are sorted based on time. My plan was to make toggle buttons to hide or unhide named ranges when they contain a certain ...
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1answer
496 views

Merge Intervals from leetcode [closed]

Given a collection of intervals, merge all overlapping intervals. input: [1,3],[2,6],[8,10],[15,18], output: [1,6],[8,10],[15,18]. The logic is very simple: just merge all the intervals ...
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1answer
538 views

Check if two date ranges overlap by X minutes

I have a list of volunteer shifts. The shifts are time ranges- for example, 9AM-2PM and 12PM-5PM. I need to check by how many minutes multiple selected shifts overlap, and then throw an error if the ...
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2answers
2k views
3
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1answer
141 views

Group time intervals together

A while back, I supplied an answer on SO for grouping time intervals together. Say you have an array like this: ...
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2answers
103 views

Pattern finding function for years between 1998 and 2017 with several test cases

Pattern matching for years, I need to be able to return all years from a string. When there is a dash "-" I need to return all numbers between. For example, '2004-2006' should return an array of ...
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1answer
63 views

Class for managing blocks of working hours

I have written the following class: NOTE: There is a bug in the third party component that means that if a DHXBlockTime is there for a day of the week and a ...
2
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1answer
42 views

Query to use the longer of two date-time ranges

I have a complex date-and-time-matching query in the middle of another huge query. I'm matching two tables, the second one is LEFT JOINed to the first. If the time ...
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0answers
65 views

Time Schedule Intersection version 2

Time schedule intersection in my original question I gave an answer which has \$O(n^2)\$ complexity. Here is the new version of the same problem. I'm trying to get to O(N+K). please review the code ...
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1answer
97 views

Query an array at intervals and getting the highest number of values

I feel like I am doing a lot of unnecessary operations and some places I feel like I am being redundant in some places. I am focused on performance and optimization. I am trying to find the five ...
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1answer
555 views

C++ header only library for interval arithmetic (only supports addition)

I'm trying to make a simple header only C++ library for interval arithmetic as a programming exercise. There are some subtle aspects of interval arithmetic (like floating point rounding mode) that I ...
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1answer
510 views

Airport scheduler

This is the problem: Airport Pretend we are operating a small airport with a single runway. We need to develop a data structure to help scheduling airplanes to take off and land from this ...
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0answers
381 views

Time schedule intersection

I had a job interview one of the questions was the following Given an api - you submit a name of a person and it gives back a sorted list of all the free time slots this person has. the list might be ...
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1answer
68 views

Excel VBA object with validated bounds for an interval

I'm working through a problem I have with Excel VBA. I have two object classes. Class clsLoadStep stores three copies of class clsLoad objects. Class clsLoad simply stores a value and a string stating ...
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1answer
5k views

An interval-map data structure

This data structure maps values from intervals of some type Key which satisfies LessThanComparable<Key> to values of some ...
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1answer
474 views

C# greedy algorithm to pick activities that do not clash with each other (corrected)

My task is the greedy algorithm: The activity selection problem is characteristic to this class of problems, where the goal is to pick the maximum number of activities that do not clash with each ...
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1answer
3k views

Implementing views on a std::vector

Goal: Wrap a vector. The wrapper can create view on part of the vector. Support const_view and view. view allows modification of elements while const_view does not. The views are ranges (has begin() ...
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2answers
2k views

Checking whether number is in given range

Introduction I want to check whether number is in given range. Function takes: long number that should be checked 2 longs threshold values byte range mode Range mode is represented as number of ...
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3answers
1k views

Leetcode 56: Merge Intervals

Problem statement Given a collection of intervals, merge all overlapping intervals. For example: Given \$[1,3],[2,6],[8,10],[15,18]\$, return \$[1,6],[8,10],[15,18]\$. My ...
4
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4answers
1k views

Points and segments solution

Task: Given a set of points on a line and a set of segments on a line. The goal is to compute, for each point, the number of segments that contain this point. Input Format The first ...
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1answer
233 views

Start and end times of recurring events

I'm working on a function that returns a specific set of times for a given timezone and a given frequency; day, week, month. For any given timezone and a frequency the function will return the ...
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1answer
64 views

Segment tree challenge

Here is my implementation of a segment tree with a sample driver file (I didn't make an update function because I didn't need it for what I was doing). I'm a huge fan of geeksforgeeks, but I do not ...