SPOJ | Some selected solutions

 by   lewin Java Version: Current License: No License

kandi X-RAY | SPOJ Summary

kandi X-RAY | SPOJ Summary

SPOJ is a Java library. SPOJ has no bugs, it has no vulnerabilities and it has low support. However SPOJ build file is not available. You can download it from GitHub.

To see problem, put Make sure it’s all caps, and don’t include the .java extension. Some files may actually have nothing of interest (i.e. it’s just a template file). This just means I forgot to implement the problem…​. to see what problems are actually solved. Some may not be included (that probably means I implemented in C++, or I can’t locate the file).

            kandi-support Support

              SPOJ has a low active ecosystem.
              It has 11 star(s) with 22 fork(s). There are 3 watchers for this library.
              It had no major release in the last 6 months.
              SPOJ has no issues reported. There are 1 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of SPOJ is current.

            kandi-Quality Quality

              SPOJ has 0 bugs and 0 code smells.

            kandi-Security Security

              SPOJ has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              SPOJ code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              SPOJ does not have a standard license declared.
              Check the repository for any license declaration and review the terms closely.
              Without a license, all rights are reserved, and you cannot use the library in your applications.

            kandi-Reuse Reuse

              SPOJ releases are not available. You will need to build from source code and install.
              SPOJ has no build file. You will be need to create the build yourself to build the component from source.
              SPOJ saves you 14779 person hours of effort in developing the same functionality from scratch.
              It has 29540 lines of code, 3006 functions and 315 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed SPOJ and discovered the below as its top functions. This is intended to give you an instant insight into SPOJ implemented functionality, and help decide if they suit your requirements.
            • not convex hull
            • Calculates the number of nodes in the network
            • Calculates the convex hull .
            • returns the number of matches
            • converts a char array to a string
            • Command line entry point .
            • Calculates the root of a string .
            • Returns the best state for the given points .
            • Find the number of words in the matrix .
            • Assigns splits to the number of splits .
            Get all kandi verified functions for this library.

            SPOJ Key Features

            No Key Features are available at this moment for SPOJ.

            SPOJ Examples and Code Snippets

            No Code Snippets are available at this moment for SPOJ.

            Community Discussions


            I am trying to find the factors of factorial of a number
            Asked 2021-Jun-10 at 21:59

            I am trying to solve the SPOJ problem DIVFACT where we need to find the factorial of a number. Though I used the correct formulae and at the same time I also checked the special case of 0 and 1,still I am getting wrong answer and it's really difficult for me to figure out what's wrong with my code. Can someone please help me figure out the problem? For reference I am providing the link to the problem:- Link of the problem



            Answered 2021-Jun-10 at 21:59

            The problem states that the answer should be in MOD 10^9+7 but you have mistakenly defined MOD as 10^8+7.

            Source https://stackoverflow.com/questions/67927710


            Vectorization or efficient way to calculate Longest Increasing subsequence of tuples with Pandas
            Asked 2021-May-30 at 03:13

            Using pandas/python, I want to calculate the longest increasing subsequence of tuples for each DTE group, but efficiently with 13M rows. Right now, using apply/iteration, takes about 10 hours.

            Here's roughly my problem:

            DTE Strike Bid Ask 1 100 10 11 1 200 16 17 1 300 17 18 1 400 11 12 1 500 12 13 1 600 13 14 2 100 10 30 2 200 15 20 2 300 16 21 ...


            Answered 2021-May-27 at 13:27

            What is the complexity of your algorithm of finding the longest increasing subsequence?

            This article provides an algorithm with the complexity of O(n log n). Upd: doesn't work. You don't even need to modify the code, because in python comparison works for tuples: assert (1, 2) < (3, 4)

            Source https://stackoverflow.com/questions/67698793


            Count number of digits in factorial - Input/Ouput performance issue
            Asked 2021-May-19 at 07:50

            I am solving task on spoj platform - count number of digits in factorial. I found Kamenetsky Formula and implemented it:



            Answered 2021-May-19 at 07:00

            I think the time limit is exceeding because of the slow I/O. This is mainly because of System.out.println's underlying PrintStream. Find more details in this post why-is-system-out-println-so-slow. You can refer to the below Fast I/O template which will help solve this problem.

            Reference - Fast I/O in java

            Source https://stackoverflow.com/questions/67598118


            Getting EOF Error while giving inputs to code
            Asked 2021-May-16 at 06:21

            I tried a problem from SPOJ called The next palindrome. The problem statement is given as

            A positive integer is called a palindrome if its representation in the decimal system is the same when read from left to right and from right to left. For a given positive integer K of not more than 1000000 digits, write the value of the smallest palindrome larger than K to output. Numbers are always displayed without leading zeros.

            Here is my code



            Answered 2021-May-16 at 06:21

            The error is caused because your input "n" makes both arguments same in the range function in this line "for j in range(int(n) + 1, 1000000 + 1)". It looks like this range(1000001, 1000001) which return nothing. Use input of "n" smaller than 1000000. It will work.

            It return empty list when I use this code.

            Source https://stackoverflow.com/questions/67553573


            How to make code faster to fit it in time limit?
            Asked 2021-Mar-08 at 07:32

            I'm trying to submit this code on spoj https://www.spoj.com/problems/PALIN which is asking to find next smallest palindrome of a given number n, but as this code works, it is slow therefor it exceeds the time limit (2-9 seconds). is there another way to solve this exercise in a faster way?

            The first line contains integer t, the number of test cases. Integers K are given in the next t lines.




            Answered 2021-Mar-08 at 07:29

            The most obvious thing to do is to stop copying and reversing the string. Instead, compare the first character to the last character, then the second to the second-to-last, and so on.

            Also, why are you using strings at all? Strings are complex and expensive. The operations you are performing can be done entirely on numbers.

            Lastly, consider numbers like "473X". None of those can ever be palindromes. You don't have to test all ten of them. If you're going to look at four-digit numbers starting with "47", there's only one that's a palindrome -- so why are you checking all hundred of them?

            Before writing code to solve a problem like this, think through the algorithm you're going to use and make sure you don't have any obvious wasted effort.

            Source https://stackoverflow.com/questions/66525751


            Using fflush for speeding up code to prevent a time limit exceeded
            Asked 2021-Mar-01 at 16:10

            The following code gets TLE (time limit exceeded) if the standard output is not flushed.



            Answered 2021-Mar-01 at 16:10

            The problem specification tells you what to do:

            Attention: the program should clear the output buffer after printing each line.

            It can be done using fflush(stdout) command or by setting the proper type of buffering at the beginning of the execution - setlinebuf(stdout).

            The problem title indicates why:


            The judging software is operating the program interactively. After giving the program an input, it waits for output before providing more input. When your program does not flush the buffered output, the judging software keeps waiting until its time limit is exceeded.

            Commonly, output streams to terminals are line-buffered, in which case printing a new-line character causes them to be flushed. However, this judging software is likely using a pipe that is fully buffered, so output will not be flushed until the buffer is full or you explicitly request a flush (or, at the start of the program, you change the buffering mode to unbuffered or line-buffered).

            When you flush the output, the judging software will see it, and then it will continue and provide more input.

            As an alternative to flushing the output after each printf, you can set the stream to line buffering mode by executing setvbuf(stdout, NULL, _IOLBF, 0); at the beginning of the program (before doing any other operation on the stream).

            Source https://stackoverflow.com/questions/66425010


            Code submission on SPOJ gives runtime error (SIGABRT)
            Asked 2020-Dec-16 at 15:23

            I have done an exercise on SPOJ to practice advanced algorithms.

            The Problem Statement is as follows:

            Harish went to a supermarket to buy exactly ‘k’ kilograms apples for his ‘n’ friends. The supermarket was really weird. The pricing of items was very different. He went to the Apples section and enquired about the prices. The salesman gave him a card in which he found that the prices of apples were not per kg. The apples were packed into covers, each containing ‘x’ kg of apples, x > 0 and ‘x’ is an integer. An ‘x’ kg packet would be valued at ‘y’ rupees. So, the placard contained a table with an entry ‘y’ denoting the price of an ‘x’ kg packet. If ‘y’ is -1 it means that the corresponding packet is not available. Now as apples are available only in packets, he decides to buy at most ‘n’ packets for his ‘n’ friends i.e he will not buy more than n packets of apples. Harish likes his friends a lot and so he does not want to disappoint his friends. So now, he will tell you how many friends he has and you have to tell him the minimum amount of money he has to spend for his friends.

            This is the code I used to solve the problem:



            Answered 2020-Dec-16 at 15:23

            Since this is a SPOJ question, and you're not given the test data, what you should do is to randomize the tests until you get a failure. That way, you may be able to get a sample case that fails. This is called fuzzing, and is a technique that can be used in your question.

            The following will work for the cases that cause segmentation faults, and in some cases, to verify if a given output matches the expected output. In other words, instead of trying to figure out the test data, let the computer generate the tests for you.

            The way you do this is to look at the constraints that the question gives you, and generate random data that fits the constraints. Since they are all integers, you can do this by using the header, and using a uniform_int_distribution.

            Here is a sample of fuzzing the data using the following constraints for N, K, and the data for prices:

            Source https://stackoverflow.com/questions/63046559


            Getting Runtime Error(SIGSEGV) on SPOJ , can't find out what's wrong in my code
            Asked 2020-Nov-13 at 07:08

            I know this type of question has been asked before but I can't find a solution to this, I know its a invalid memory reference error or array out of bounds, but I can't seem to find the cause of the error in my code. I just tried this problem on SPOJ, it was the 'Transform the Expression' https://www.spoj.com/problems/ONP/ my all test cases are right!

            here is my code:



            Answered 2020-Nov-13 at 07:08
            using namespace std;
            int main() {
            long long int t;
                string str;
                std::stack f ;
                string ans="";
                for(int i=0;i0){  // Change 2

            Source https://stackoverflow.com/questions/64816417


            Output is correct but SPOJ gave me wrong answer
            Asked 2020-Oct-07 at 11:57

            Quick question. This is the code that I wrote to finish a problem in SPOJ. The output is correct but it gives me wrong answer. Whats wrong with my code? This is the link to the question: https://www.spoj.com/problems/SUMUP/



            Answered 2020-Oct-07 at 10:30


            Is there a way to update the tkinter messageboxes live?
            Asked 2020-Oct-03 at 14:05

            I am trying to make a GUI(using tkinter) for checking the code using test cases. Just like you see in Competitive Programming Websites like Hackerrank , SPOJ , CodeForces etc.

            Now I have somehow managed to print in the terminal for what test cases the code failed and for what the code passed.

            But the catch is , I want to do the same in tkinter messageboxes.

            My code runs in loop , so it checks each and every test cases and then prints out the result immediately rather than storing all the result in a list and checking them in the end.

            So I want my Messagebox to also do the same i.e update everytime a test cases has been evaluated and show whether the test case was passed or not?

            Is it possible to implement?



            Answered 2020-Oct-03 at 07:48

            If you mean the messagebox module that comes with tkinter, then no. But you can easily make your own message boxes with the Toplevel widget, and those can do anything you want.

            Source https://stackoverflow.com/questions/64181744

            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install SPOJ

            You can download it from GitHub.
            You can use SPOJ like any standard Java library. Please include the the jar files in your classpath. You can also use any IDE and you can run and debug the SPOJ component as you would do with any other Java program. Best practice is to use a build tool that supports dependency management such as Maven or Gradle. For Maven installation, please refer maven.apache.org. For Gradle installation, please refer gradle.org .


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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