Considering the problem:
Make a function to find the common elements of the lists in a list of lists.
Example:
common ( [ [1,2,3,3,5,11], [2,2,2,3,3,5], [2,2,3,3,4,5,6,7,18,19], [3,5,10,15] ] ) = [3, 5].
I came up with this solution:
import Data.List(group, nub, sort)
-- |
-- ...
I saw this question somewhere:
There is an 8-digit number. The first digit from left to right determines how many zeroes are in the number. The second digit tells you how many 1s are in the number, the third digit tells you how many 2s are in the number and so on, until the 8th digit, which tell...
fguchelaar's answer more than covers exactly what needs to be done to solve the specific problem in a safe way, but I figured it might be useful to break down the various problems in the source code (there are multiple) and show the correct options.
For the sake of explanation, I'm working in a ...
I'm getting this error:
The operator < is undefined for the argument type(s) java.util.ArrayList<FacebookUser>, java.util.ArrayList<FacebookUser>
for this:
class FriendsComparator implements Comparator<FacebookUser>
{
@Override
public int compare(FacebookUser o1, Facebook...
im VERY new to c++ and decided to take an online class for my degree which gives me very little help outside of the book. this code is from a prior assignment and now i have to tweak this 1 to take 5 numbers find their sum and print in REVERSE order. i have no idea how to do the latter. I'm not ...
My code below returns a JSON data based on user's input or query in my html page or template. However I need to modify or do some tweaking with my JSON data in order for me to use it in my datatables plugin. I am using underscore.js to reconstruct the JSON data.
def brgy_info(request):
if re...
There is a much better way to create a single digit that meets all the criterion - loop over the key value and insert the number of required digits into a string, then convert the string to an int:
def get_num(key):
val = ""
for i in range(0, len(key)):
val = int(key[i]) * str(i...
Here's the full block of code: http://pastebin.com/GTx6pSr5
and here's the section that is making it crash: http://pastebin.com/vb8PKSAv
It prints the first array after the user selects item 3 from the menu then fails to respond after it gets to the second array. Any ideas what might be causing...
As a part of bigger application I wrote code which create a display for countdown of a given time. It is nothing fancy, but still I would appreciate a review. I especially concerned about:
use of JFrame - this is second JFrame in my app, called separately by other GUI component - i read that it...
I am creating a boiler-plate namespace that will allow me to ensure proper coding practices are followed and avoid gotchas.
Looking over my code below; can you see any "no-no's" or gotchas? Can you also provide advice on anything I should do differently or add?
#ifndef PROJECT_INTERFACES_H_
#de...
I'm looking to define the Rebol date format in BNF notation (as adapted for Rebol Parse). I'd like as best as possible to only define valid dates—at least those that are valid in Rebol at the moment:
Rebol [
Title: "A Formal Description of Rebol Dates"
Date: 23-Apr-2015
File: %date-g...
I am using the example in Parse for geolocation and when I run the following code I get the error: "Use of unresolved identifier 'userObject' " as well as "Use of unresolved identifier 'placesObjects'".
Any idea how to fix this?
// User's location
let userGeoPoint = userObject["location"] as
/...
The calculator supports the basic operators (Add,Substract,Divide,Multiply).
At the moment,
It only works with positive integers
I do not validate my user input
My division rounds up if it isn't an integer
This is a work in progress. It is my first Python application so I want to get feedb...
How to get value in gridview when combo box value change in c# windows form 3- tier architecture.
I want to replace or improve the select command of tblVisor to make it more faster.
Is there any way to improve this sql command?
SELECT tblVisor.supervisor_id,
tblVisor.last_name,
tblVisor.first_names,
tblVisor.employee_job_profile_id,
org_employees.last_name,
...
I'd like to know if the following class design is good or bad
#include <iostream>
#include <vector>
#include <string>
#include <map>
using namespace std;
struct Student {
string Firstname;
string Surname;
string IDNumber;
int Age;
};
class Exam {
string ExamNo;
int Quest...
As per the below question picked from self training exercise:
Q4: In passing, Ben also cryptically comments, "By testing the signs of the endpoints of the intervals, it is possible to break mul_interval into nine cases, only one of which requires more than two multiplications." Write a fast m...
I've put together a class whose goal is to store objects of arbitrary type, with each type having its own vector for contiguity. I'd like to gather advice on what I have so far before I carry on.
Let me show you the code, along with a main() so you can compile and run it easily (you'll need C++1...
What's going on:
- On ComponentWillMount: set state.date from props
- Update the state.displayDate with a setInterval
Is this a good pattern or what are the alternatives?
var MomentAgo = React.createClass({
propTypes: {
date: React.PropTypes.string.isRequired
},
getInitialState: funct...
fguchelaar's answer more than covers exactly what needs to be done to solve the specific problem in a safe way, but I figured it might be useful to break down the various problems in the source code (there are multiple) and show the correct options.
For the sake of explanation, I'm working in a ...
If I have a node class and that class contains only the pointers to its outgoing edges.
The edge class has pointers to source and destination.
I am going through the CodingBat exercises for Java. Here is the one I have just finished:
Given a string, compute recursively the number of times lowercase hi appears in the string, however do not count hi that have an x immedately before them.
And here is my code:
public int countHi2(St...
The unnecessary part (as explained in Simon's answer) also has a flaw:
if (array[i] > k) {
i += 2;
start = i;
sum = 0;
continue;
}
Here, i += 2; not only ignores the current element as intended, but also skips the next element. So, it will fail if this n...
My script reads two .csv files and generates one dictionary per .csv file.
import csv
# First dictionary
first_dict = {}
with open(first_file, 'r') as f:
csvReader = csv.reader(f)
next(csvReader, None) # skip the header
for row in csvReader:
key = row[0]
first_dict[ke...
This came up when I answered another post.
Is there a better way?
public class Bits
{
public static void MinMaxI(ulong _bits, out long _min, out long _max)
{
// ? unsigned range with at least one value bit
if (_bits < 2 || _bits > 64)
{
throw new Syst...
I'm working on learning escape sequences and ASCII codes. When I run the following program:
#include <stdio.h>
int main(void) {
puts("Today's TODO List!");
puts("==================");
printf("\x2D Wash the dishes\n\x2D Clean living room\n\x2D Discard papers on kitchen table");
return 0...
I have a class with which I want to persist a conditional expression
boolean x = a [GT] i
I am only concerned with boolean outcome of that comparision, 'a' '[GT]' and 'i' are supplied as arguements at runtime
Below is the class I have created
public class RuleClauseCondition {
RuleClauseO...
