Questions tagged [parsing]
This tag denotes challenges where parsing input is a large / the main part of the challenge.
27
votes
27answers
4k views
Parse a C++14 integer literal
According to http://en.cppreference.com/w/cpp/language/integer_literal, integer literals consist of a decimal/hex/octal/binary literal and a optional integer suffix, that is obviously completely ...
8
votes
8answers
547 views
Type-check an expression
Given an infix expression, determine whether all constants are of the same type.
Operators will consist only of these dyadic operators: +-/*
Your program or ...
14
votes
14answers
1k views
Multiply Two Integer Polynomials
Your task is to take two single-variable integer polynomial expressions and multiply them into their unsimplified first-term-major left-to-right expansion (A.K.A. FOIL in the case of binomials). Do ...
6
votes
5answers
625 views
Gotta Collect 'Em All
Your task here will be to write a very dumb AI capable of fetching all treasures on a map.
Map
The map is defined as follow: (artist-mode™-powered)
Basic case:
<...
11
votes
31answers
743 views
Sum integers in a string
Input
A string.
Output
The sum of all integers in the line.
Constraints
1≤Length of line≤500
Sample test Case
Input
the 5is 108 seCONd4 a
Output
...
17
votes
4answers
1k views
What have we got?
Inspired by, and in memory of, our beloved genius,
R.I.P.
He invented and implemented dfns — his magnum opus and the subject of the challenge.
For the interested: latest full dfns documentation and ...
1
vote
0answers
54 views
Bracket checking [duplicate]
Consider a string like:
a.push(c.push("a",["ad","bd",2,{"ard",duo}]).pop().replace(2,"tg").enc([3,{2,adf},"atr"],5)
Write a program that will verify whether a ...
8
votes
1answer
354 views
Fully Modular C: Grading
You are a Computer Science professor teaching the C programming language. One principle you seek to impart to the students is modularity. Unfortunately, past classes have tended not to get the message,...
14
votes
5answers
281 views
Conjugation in Real Life
In @Adám's Dyalog APL Extended, the ⍢ (under) operator means conjugation: apply one function, then a second function, then the inverse of the first. It's fun to ...
13
votes
3answers
266 views
Unminify a Pythlike String
Pyth is perhaps the most successful general-purpose golfing language. Though it is somewhat in decline as a result of newer languages, from 2014 to 2016 Pyth's concise syntax, constant updates, ...
10
votes
0answers
267 views
Captcha Capture [closed]
Captchas aren't meant to be machine-readable, and that's terrible. It is time to end this obvious bout of unfounded hatred for machines just trying to let you know about great deals on ṗḧ@ṛḿ4ćëüẗ1ċäḷṡ ...
41
votes
12answers
4k views
Read out the C variable declaration
Background
Variable declaration statement in C consists of three parts: the name of the variable, its base type, and the type modifier(s).
There are three kinds of type modifiers:
Pointer ...
3
votes
7answers
473 views
Transpile Brainstract to Brainfuck
Introduction
Brainstract, a newly created dialect of Brainfuck adds a bit more elements to the syntax. In addition to the normal Brainfuck syntax, there are macros. To define a macro:
...
4
votes
0answers
220 views
Simulate Casio S-VPAM calulator [closed]
It is 20th anniversary of Casio's S-VPAM calculators and it is worth celebrating.
Task: Process input string as Casio S-VPAM calculator does. The infix notation and precedence of mathematical ...
18
votes
10answers
625 views
Decrypt the extended Wechsler format
This challenge is based on a sandbox post by user48538. Since he is no longer active on this site, I took over this challenge.
apgsearch, the distributed soup search program for Conway's Game of Life ...
6
votes
2answers
186 views
What associativity was it again
Non-associative operators (for example the subtraction-operator) often are either left- or right associative, such that one has to write less parentheses. Consider for example the following:
$$
a-b-c
...
14
votes
10answers
1k views
Decoding the Kaadi system
You have come across an old Indian manuscript, one that describes mounds of buried treasure. The manuscript also tells you the location of the treasure, except that some crucial numbers have been ...
17
votes
26answers
2k views
Elixir Array Syntactic Sugar
In Elixir, (linked) lists are in the format [head | tail] where head can be anything and tail is a list of the rest of the list, and ...
-5
votes
5answers
209 views
Get the number of images on a webpage [closed]
Recreational languages win at code golf too much. This challenge is simple, when using higher level functions.
The task is as follows:
Given any valid url, which is guaranteed to result in a valid ...
1
vote
0answers
387 views
11
votes
0answers
433 views
Complement of a Regex
For the purposes of this challenge, we define a postfix regex dialect with alphabet {1, 0} and the following operations:
1 and <...
21
votes
24answers
2k views
Ten-pin bowling score - World Bowling edition
World Bowling scoring
Many people have gone to their local bowling center to play a few games of bowling, and many people continue to struggle to calculate their scores. World Bowling has introduced ...
16
votes
6answers
477 views
Panfix to parenthesized infix
Quylthulg is a language by Chris Pressey that attempts to solve the problem of infix notation using what it calls panfix:
like postfix, panfix does not require the deployment of arcane contrivances ...
-6
votes
5answers
341 views
Write a bullet-proof “Atof” [closed]
Write a bullet-proof "Atof"
Atof (Array to float) is a function that every language has to have. (K&R: Atof in chapter 4.2 ...
6
votes
3answers
211 views
Of Dumps and Cubes, and Structured Nonsense
Your challenge is to translate a Cubically cube-dump to the format specified in this challenge.
Input
The input will represent a Rubik's Cube, formatted how Cubically prints its memory cube at the ...
11
votes
3answers
321 views
Same Name, Lame!
Write a function or program that, when given a list of names, outputs or returns a list where duplicates of given names have a unique shortened version of their surname.
Input:
A list of names, ...
20
votes
56answers
5k views
Compare two numbers given as strings
I have a problem at work. I need to compare two numbers that come as strings from two different databases. The numbers may come with leading zeroes and/or leading/trailing spaces. So I may have ...
21
votes
5answers
715 views
Convert a HTML page into a mountain
Task: convert a HTML page into a mountain!
When HTML pages are indented, they can look like:
...
10
votes
9answers
795 views
R[oman|everse] Polish Notation
It is the year MDLXVII in a world in which the Roman Empire never fell, and the collapse into the dark ages never occurred. Due to the extended period of Pax Romana, the empire's economic stability ...
3
votes
0answers
192 views
2017 SCRAM Finder
Background
The nuclear industry has term, SCRAM, used to describe a quick shutdown of the reactor. There's a fun myth that it stands for "Safety Control Rod Ax Man," the role which served to shut ...
24
votes
14answers
1k views
Parse the Parcel
Thanks to your help in the Mark My Mail challenge, PPCG-Post has successfully stamped all of its parcels with the generated barcodes!
Now, it's time to decode them.
In this challenge your program ...
16
votes
15answers
714 views
Parse a list of signed unary numbers
Unary numbers typically only represent nonnegative integers, but we can extend them to represent all integers as follows:
A positive integer N is represented as N 1...
19
votes
4answers
843 views
Clearly parenthesize APL trains
In APL, you can write tacit functions, called trains. How they work is irrelevant for this challenge. Here are the different ways they can be grouped, using ⍴ as ...
7
votes
3answers
724 views
The Missing Number - Version 2
Background:
This question is a remix of the one that I made previously on this forum. The only difference with this one is: the range is significantly larger, AND dynamic. Details below!
Also, I'm ...
22
votes
3answers
3k views
The Missing Number Revised
Background:
I originally posted this question last night, and received backlash on its vagueness. I have since consulted many personnel concerning not only the wording of the problem, but also its ...
21
votes
25answers
3k views
Parse my Esperanto!
The famous constructed language Esperanto uses the Latin alphabet (mostly, see the linked wikipedia page for details). However, there are some characters with accents: ĉ, ĝ, ĥ, ĵ, ŝ, and ŭ. (C-...
20
votes
16answers
1k views
Simple markdown rendering
There are several ways to create headers on posts on the Stack Exchange network. The format that's most commonly1 used on PPCG seems to be:
...
9
votes
13answers
520 views
Expand Comparison Chains
Unlike most languages, Python evaluates a<b<c as it would be done in mathematics, actually comparing the three numbers, as opposed to comparing the boolean <...
17
votes
3answers
486 views
Exponentiation to multiplication to addition
Multiplication between 2 integers can be reduced into a series of addition like so
3 * 5 = 3 + 3 + 3 + 3 + 3 = 5 + 5 + 5
Exponentiation (raising a to the power b)...
10
votes
3answers
613 views
Exact Cover Puzzle
CHALLENGE
Given a set of grouped letters, arrange them onto the board so that they cover the area entirely.
Board Representation (a.k.a. the SHIP DECK)
The board is a 6x6 grid.
There will always be ...
9
votes
14answers
973 views
Increasing, decreasing, none or all?
Take two inputs, a non-empty vector/list containing digits 1 and 2 and a string (no, you may not take ...
7
votes
3answers
519 views
Logical Order of Operations
Task
Given an input, evaluate it as a mathematical equation following the order of operations.
But, instead of the using PEMDAS, we drop the parentheses and exponentiation and introduce spaces - ...
23
votes
5answers
858 views
Complex Dice Rolling Expressions
Background
I play D&D on a regular basis with some friends. While talking about the complexity of some systems/versions when it comes to rolling dice and applying bonuses and penalties, we ...
36
votes
15answers
3k views
Will I tip over?
Overview
Given a 3 line string, figure out if the structure falls to the left, balances, or falls to the right.
Input structure
You can imagine the structure as metal rod with stuff on top, all ...
7
votes
3answers
321 views
Identify the direction of lines in an ASCII-figure
Challenge:
Take a rectangular figure consisting of the two characters # and (whitespace, ASCII-32), and identify which ...
20
votes
22answers
1k views
Simplify matrix input!
I have written a few challenges related to matrices, and common for all are that I use a format like the one below when representing the matrices, both in examples and in test cases:
...
24
votes
10answers
1k views
Convert a TIO answer to a CMC answer
Let's for once do something useful.
Given the text from a Try It Online codegolf submission, produce the equivalent Chat Mini Challenge submission, which is of the form
...
18
votes
11answers
1k views
Swep tha vowels!
Note: the title was misspelled intentionally.
Given a string s, swap the first vowel runs of every 2 words. For this challenge, y is considered a vowel.
For example, given an input of "great day sir"...
5
votes
1answer
1k views
Regular expression parser
This task is a classic programming task: Implement a regular expression parser. That is, write a program or function which takes a string describing a regular expression and a candidate string, and ...
11
votes
1answer
219 views
I <3 conditionals
You end up having a lot of very long, boring-looking conditionals in your code:
if flag == 1:
while have != needed:
if type == 7:
These can be transformed into ...
