codejam | Google Code Jam , and a library of helper functions | Learning library
kandi X-RAY | codejam Summary
kandi X-RAY | codejam Summary
Google Code Jam solutions and helper library.
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Top functions reviewed by kandi - BETA
- Searches the given chests
- Return the number of occurrences of x
- Compute the number of possible players in the basis
- Calculates the expected profit
- Explore at a given bound
- Calculates the spread of N prime numbers
- Bounding search function
- Solve the k k k k in the heap
- Wrapper function for minimise x
- Convert row to target position
- Calculate the number of votes to round up to p
- Test the cost function
- Compute the score of the score between two blocks
- Calculate the expected profit
- Compute the score of a given matrix P
- Calculate the warping of a given naomi score
- R minimise a convex2
- Estimate the shape of the shape
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codejam Examples and Code Snippets
Community Discussions
Trending Discussions on codejam
QUESTION
I was trying to understand the solution to the codejam problem mentioned by the title. Specifically the third part for "extra credits". This is the solution by "kamyu104" from Github.
...ANSWER
Answered 2021-Apr-25 at 05:42This rather terse code implements a dynamic programming algorithm that has been optimised to reduce the space usage from O(n) to O(1). First I'll describe an equivalent DP and how it can be computed, and then show how the many separate cases it needs to handle can be viewed as instances of a smaller number of more general "case templates", which kamyu's code exploits for concision.
A correct but verbose DP algorithmThe question frames the problem as finding a minimum-cost way to replace each "?" character with a J or C, but we can alternatively frame it as finding a minimum-cost way to replace all characters of the input string S, provided that we never change a J to a C or vice versa -- that is, we can imagine ourselves "replacing" an existing J with another J, or an existing C with another C. In fact, that "provided" clause can even be removed: We can get what we want by permitting all possible replacements, including a J to be changed to a C or vice versa, but prevent these undesirable changes from actually appearing in any optimal solution by penalising them with enormous costs.
Let's define the function f(m, a) to be the minimum cost of a solution to the subproblem consisting of the first m+1 characters of the input string S, under the assumption that we replace the final (i.e., (m+1)-th) character with a, which must be either "J" or "C". (Why m+1 and not m? That just makes code with 0-based array indices simpler.) Replacements that leave this character unchanged (J->J or C->C) are allowed, as are replacements of "?" characters to either J or C. The way we will prevent changing an existing J to a C or vice versa is to assign infinite cost to such a replacement -- this will result in this choice never being taken, since another lower-cost choice is always available.
We can compute values of f(m, a) as follows. I'll use Python-like pseudocode that writes to a DP matrix dp[][].
The highest-priority rule is that we should always assign infinite cost to any attempt to change a hardwired letter to the other letter. Other than that, the cost of assigning a particular letter depends on the preceding letter -- unless there is no preceding letter because we are at the very start, in which case we know that the cost is zero:
QUESTION
I am populating the following vector with non-negative integers for a codejam problem:
...ANSWER
Answered 2021-Mar-30 at 13:43Your lambda only takes the first element into account, but obivously a pair consists of two elements. With your lambda pairs with identical first but different second elements will be considered as equal. Thus their relative order after sorting is unspecified.
If you want to sort data like the following:
QUESTION
This code is for the Google codejam competition. The below code is compiling correctly on my PC and gives the correct result for the sample code. However it is showing runtime error whenever I try to run it on the google website. I have been messing with it for one hour and still have no idea what's wrong with it.
...ANSWER
Answered 2021-Mar-26 at 19:12try this
QUESTION
What i am missing here in this code? It results in RE in Kickstart 2020 but when i test on my local machine or hackereath compiler(similar to codejam complier) code works fine.
problem link:
https://codingcompetitions.withgoogle.com/kickstart/round/000000000019ffc7/00000000001d3f56
ANSWER
Answered 2020-Aug-22 at 07:43At the print statement in which use of f is resulting in RE.
In the print statement, you should use format to output i+1 and j.
To pass all the test cases you have to sort the array to calculate number of houses by the greedy method.
QUESTION
Currently trying to learn and get better at Python through these kinds of exercises; the problem I'm trying to solve is a scheduling task, more specifically the Parent Partnering Returns task from Google Code Jam 2020.
My code passes the sample test cases, but outputs the wrong answer when submitted. I've tried to come up with many different kinds of test cases to find the cracks in my code, but none of them have led me to find the inherent issue.
My approach is to sort the list of tasks by increasing start time, then assign them to Jamie or Cameron. If one of them has an existing activity that ends before the start time to be assigned, then the other person will be assigned the activity at hand. If both do, then a valid schedule is impossible.
Screenshot of Sample taken from Code Jam Site (my code passes these test cases)
Below is the code I have, any help for finding the issue or a test case that fails would be greatly appreciated:
...ANSWER
Answered 2020-Jun-10 at 23:50I was able to break it. Test case:
QUESTION
I have gone through the below codejam question. I could not solve it on my own. So I have gone through the analysis. I know T(0,0) = 0, because sheep does not need to make any moves. But i did not understand how T(1,0)=T(0,1)=3? To solve the recurrence relation I need to know the value of T(1,0) or T(0,1) which is 3. Can any one explain me clearly? Any help will be appreciated.
https://codingcompetitions.withgoogle.com/codejamio/round/0000000000050fc5/0000000000054edd
...ANSWER
Answered 2020-May-07 at 18:13If the sheep is at (0, 1), one sheepdog will put itself at (0, 2), and the other at either (-1, 1) or (1, 1) (it doesn't matter). Then half the time the sheep will move to the target, the rest of the time to (1, 1) (or (-1, 1) if the sheepdog was on the other side).
From (1, 1), as the question says, the sheepdogs will put themselves at (2, 1) and (1, 2), and the sheep will move to either (1, 0) or (0, 1).
Let E0 be the expected number of steps from (1, 0) (or equivalently (0, 1)), and E1 be the expected number of steps from (1, 1) (or equivalently (-1, 1)).
Then E0 = 1/2 + (1+E1)/2, and E1 = 1+E0.
So E0=1/2 + (1+1+E0)/2 = 3/2 + E0/2, giving E0=3. This also gives E1=4, which agrees with the result in the question.
QUESTION
I tried downloading the example interactive problem number guessing problem. They offer a local testing tool in the Description tab, a python solution in the Analysis tab, a interactive_runner.py that runs both scripts simultaneously.
After saving the solution in a solution.py, I can run this on shell successfully with: python3 interactive_runner.py python3 local_testing_tool.py 0 -- python3 solution.py.
The problem is I can't debug it using VSCode. I tried putting all 3 files in one folder and using the following launch.json:
...ANSWER
Answered 2020-Apr-28 at 23:37The "program" argument expects only the path to a file, hence the error about there being "no such file or directory". What you want to do is take the rest of your execution line and make them arguments:
QUESTION
This is the code which I submitted in the second question of the Qualification Round of Google CodeJam but the compiler showed RunTime Error. But this runs on the Code Blocks just fine. Why is that?
Problem
Given a string of digits S, insert a minimum number of opening and closing parentheses into it such that the resulting string is balanced and each digit d is inside exactly d pairs of matching parentheses.Let the nesting of two parentheses within a string be the substring that occurs strictly between them. An opening parenthesis and a closing parenthesis that is further to its right are said to match if their nesting is empty, or if every parenthesis in their nesting matches with another parenthesis in their nesting. The nesting depth of a position p is the number of pairs of matching parentheses m such that p is included in the nesting of m.
For example, in the following strings, all digits match their nesting depth:
0((2)1),(((3))1(2)),((((4)))),((2))((2))(1). The first three strings have minimum length among those that have the same digits in the same order, but the last one does not since((22)1)also has the digits221and is shorter.
Given a string of digits S, find another string S', comprised of parentheses and digits, such that: all parentheses in S' match some other parenthesis, removing any and all parentheses from S' results in S, each digit in S' is equal to its nesting depth, and S' is of minimum length.
...ANSWER
Answered 2020-Apr-13 at 12:20I checked the description of the problem and found this:
QUESTION
The Judging System says this solution gives a wrong answer, but I could not figure out why. Any insights would be much appreciated.
...ANSWER
Answered 2020-Apr-06 at 01:05You implemented a brute force way to solve it. Your code runs slow, Time complexity O(N^2), but you can do it in O(N*log(N))
Instead of check with notOverlap(activity, arr), sort the array and check with the last ending time activity of C or J. ( Greedy Way to solve it )
You have to store the index of activity before sorting the array.
Here is my solution, but before reading the solution try to implement it yourself
QUESTION
This question was asked on 4th april in google codejam : https://codingcompetitions.withgoogle.com/codejam/round/000000000019fd27/000000000020bdf9.
The description of question is :
Cameron and Jamie's kid is almost 3 years old! However, even though the child is more independent now, scheduling kid activities and domestic necessities is still a challenge for the couple.
Cameron and Jamie have a list of N activities to take care of during the day. Each activity happens during a specified interval during the day. They need to assign each activity to one of them, so that neither of them is responsible for two activities that overlap. An activity that ends at time t is not considered to overlap with another activity that starts at time t.
For example, suppose that Jamie and Cameron need to cover 3 activities: one running from 18:00 to 20:00, another from 19:00 to 21:00 and another from 22:00 to 23:00. One possibility would be for Jamie to cover the activity running from 19:00 to 21:00, with Cameron covering the other two. Another valid schedule would be for Cameron to cover the activity from 18:00 to 20:00 and Jamie to cover the other two. Notice that the first two activities overlap in the time between 19:00 and 20:00, so it is impossible to assign both of those activities to the same partner.
Given the starting and ending times of each activity, find any schedule that does not require the same person to cover overlapping activities, or say that it is impossible.
Input The first line of the input gives the number of test cases, T. T test cases follow. Each test case starts with a line containing a single integer N, the number of activities to assign. Then, N more lines follow. The i-th of these lines (counting starting from 1) contains two integers Si and Ei. The i-th activity starts exactly Si minutes after midnight and ends exactly Ei minutes after midnight.
Output For each test case, output one line containing Case #x: y, where x is the test case number (starting from 1) and y is IMPOSSIBLE if there is no valid schedule according to the above rules, or a string of exactly N characters otherwise. The i-th character in y must be C if the i-th activity is assigned to Cameron in your proposed schedule, and J if it is assigned to Jamie.
If there are multiple solutions, you may output any one of them.
...ANSWER
Answered 2020-Apr-05 at 08:57You are asked to assign 'C' or 'J' to the original order of the tasks given in the input. So before sorting, you should save the index of the tasks and once sorted, assign 'C' or 'J' to those saved indices.
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Install codejam
You can use codejam like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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