C#•2y ago

✅ need help with a problem

i know what im supposed to do but im having trouble implementing it. i need to add the sum of a list except for the minimum value and do the same but this time except the maximum value

82 Replies

shawski.OP•2y ago

i could do

arr.Sum()-arr.Min();

arr.Sum()-arr.Min();

that would get me one of them it has to be in the form x y ill give an example

1 2 3 4 5

1 2 3 4 5

1+2+3+4 = 10 2+3+4+5 = 14 answer: 10 14

 public static void miniMaxSum(List<int> arr)
    {
        int a = arr.Sum() - arr.Max();
        int b = arr.Sum() - arr.Min();

        Console.WriteLine(a + " " + b);
    }

 public static void miniMaxSum(List<int> arr)
    {
        int a = arr.Sum() - arr.Max();
        int b = arr.Sum() - arr.Min();

        Console.WriteLine(a + " " + b);
    }

im curious why this worked for 3/14 tests, but failed the rest

Unhandled exception. System.OverflowException: Arithmetic operation resulted in an overflow.
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at Result.miniMaxSum(List`1 arr) in /tmp/submission/20221204/04/00/hackerrank-a6dbcc82c252190428c82ae94e977449/code/Solution.cs:line 26
   at Solution.Main(String[] args) in /tmp/submission/20221204/04/00/hackerrank-a6dbcc82c252190428c82ae94e977449/code/Solution.cs:line 41
Aborted (core dumped)

Unhandled exception. System.OverflowException: Arithmetic operation resulted in an overflow.
   at System.Linq.Enumerable.Sum(IEnumerable`1 source)
   at Result.miniMaxSum(List`1 arr) in /tmp/submission/20221204/04/00/hackerrank-a6dbcc82c252190428c82ae94e977449/code/Solution.cs:line 26
   at Solution.Main(String[] args) in /tmp/submission/20221204/04/00/hackerrank-a6dbcc82c252190428c82ae94e977449/code/Solution.cs:line 41
Aborted (core dumped)

the error ^

Deneri•2y ago

Overflow means you went past the end of int. Probably added two very large ints. That went beyond the valid range of int

shawski.OP•2y ago

hmm ill send some of the numbers being tested @Deneri

256741038 623958417 467905213 714532089 938071625

256741038 623958417 467905213 714532089 938071625

this is 1 of the 14 inputs being tested against my algorithm they are adding massive numbers. the question is, what do i do about that? all the tests past if the numbers were much lower

shawski.OP•2y ago

shawski.OP•2y ago

that passed for example if the problem calls for me to add the numbers, but the numbers are too large... it kinda seems impossible from my pov. maybe there are some solutions to this though, but i cant think of any

Deneri•2y ago

Don't store the result in an int. An int is too small. Store the result in something bigger.

shawski.OP•2y ago

alright

shawski.OP•2y ago

i stored it as a long same tests pass same ones fail i guess the calculations are still using an integer im stumped

custard•2y ago

Don't forget to change the type of the arr parameter to List<long>

shawski.OP•2y ago

yeah i tried that. it seems to break the whole program.

Kouhai•2y ago

What's the expected method signature?

shawski.OP•2y ago

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Result
{

    /*
     * Complete the 'miniMaxSum' function below.
     *
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static void miniMaxSum(List<int> arr)
    {
        long a = arr.Sum() - arr.Max();
        long b = arr.Sum() - arr.Min();
        
        Console.WriteLine(a + " " + b);
    }

}

class Solution
{
    public static void Main(string[] args)
    {

        List<int> arr = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt32(arrTemp)).ToList();

        Result.miniMaxSum(arr);
    }
}

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Result
{

    /*
     * Complete the 'miniMaxSum' function below.
     *
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static void miniMaxSum(List<int> arr)
    {
        long a = arr.Sum() - arr.Max();
        long b = arr.Sum() - arr.Min();
        
        Console.WriteLine(a + " " + b);
    }

}

class Solution
{
    public static void Main(string[] args)
    {

        List<int> arr = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt32(arrTemp)).ToList();

        Result.miniMaxSum(arr);
    }
}

Kouhai•2y ago

Okay, what's the current problem With long there should be no overflows

shawski.OP•2y ago

the results of both calculations are being stored in the variable but the list is an

int

int

Kouhai•2y ago

Oh I didn't notice it's a int You can modify main or no?

shawski.OP•2y ago

i dont believe im supposed to i mean i can fix it if i edit main i could give that a go, just im not sure if i m supposed to do that

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Result
{

    /*
     * Complete the 'miniMaxSum' function below.
     *
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static void miniMaxSum(List<long> arr)
    {
        long a = arr.Sum() - arr.Max();
        long b = arr.Sum() - arr.Min();

        Console.WriteLine(a + " " + b);
    }

}

class Solution
{
    public static void Main(string[] args)
    {

        List<long> arr = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt64(arrTemp)).ToList();

        Result.miniMaxSum(arr);
    }
}

using System.CodeDom.Compiler;
using System.Collections.Generic;
using System.Collections;
using System.ComponentModel;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Runtime.Serialization;
using System.Text.RegularExpressions;
using System.Text;
using System;

class Result
{

    /*
     * Complete the 'miniMaxSum' function below.
     *
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static void miniMaxSum(List<long> arr)
    {
        long a = arr.Sum() - arr.Max();
        long b = arr.Sum() - arr.Min();

        Console.WriteLine(a + " " + b);
    }

}

class Solution
{
    public static void Main(string[] args)
    {

        List<long> arr = Console.ReadLine().TrimEnd().Split(' ').ToList().Select(arrTemp => Convert.ToInt64(arrTemp)).ToList();

        Result.miniMaxSum(arr);
    }
}

edited verison @Kouhai it passed all the 14 tests i couldve done that the whole time. i guess i was just under the impression that i wasnt supposed to edit main

Kouhai•2y ago

If you don't want to edit main you can do this

public static void miniMaxSum(List<int> arr)
{
    long a = arr.Sum(m => (long)m) - arr.Max();
    long b = arr.Sum(m => (long)m) - arr.Min();

    Console.WriteLine(a + " " + b);
}

public static void miniMaxSum(List<int> arr)
{
    long a = arr.Sum(m => (long)m) - arr.Max();
    long b = arr.Sum(m => (long)m) - arr.Min();

    Console.WriteLine(a + " " + b);
}

shawski.OP•2y ago

im curious, what is |

 
(m => (long)m)

 
(m => (long)m)

doing?

Kouhai•2y ago

It casts the int in arr to long before summing

shawski.OP•2y ago

does the "m" mean something specifically?

Kouhai•2y ago

No, m is just the name I chose randomly It's basically a variable name

shawski.OP•2y ago

oh where was it initialized? or i guess it was initizilized in that that scope ive never seen that so im pretty confused on which each component is doing

Kouhai•2y ago

That syntax is for lambda expressions in C# If you don't know what lambda expressions are, they are basically an anonymous function that can be executed. (If this is more confusing and makes it harder, reading the docs might help) https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/lambda-expressions

Lambda expressions - Lambda expressions and anonymous functions

C# lambda expressions that are used to create anonymous functions and expression bodied members.

shawski.OP•2y ago

alright thank you 😄

Kouhai•2y ago

But also you can just do

public static void miniMaxSum(List<int> arr)
{
    long a = arr.Cast<long>().Sum() - arr.Max();
    long b = arr.Cast<long>().Sum() - arr.Min();

    Console.WriteLine(a + " " + b);
}

public static void miniMaxSum(List<int> arr)
{
    long a = arr.Cast<long>().Sum() - arr.Max();
    long b = arr.Cast<long>().Sum() - arr.Min();

    Console.WriteLine(a + " " + b);
}

shawski.OP•2y ago

what does Cast do?

Kouhai•2y ago

Cast<T> as the name suggests casts an IEnumerable<T> to another IEnumerable<T>

shawski.OP•2y ago

@Kouhai quick question, how can i check whether a number is odd or even? nvm

shawski.OP•2y ago

shawski.OP•2y ago

im curious why this worked

shawski.OP•2y ago

24 / 2 doesnt = 0

shawski.OP•2y ago

it failed 2/8 tests the rest did fine wait it isnt dividing it

Kouhai•2y ago

%

shawski.OP•2y ago

thats what "/" would do yeah

Kouhai•2y ago

% is modulo operator

shawski.OP•2y ago

but im curious why 2 tests failed but 6 passed 20 % 2 = 0

shawski.OP•2y ago

shawski.OP•2y ago

so why is it printing "Weird" here

Kouhai•2y ago

20 % 2 will return 0, I'm not sure if another part of the code is causing that error

shawski.OP•2y ago

i ran the code in vsc and it prints "Not Weird" i dont think the problem lies with my code..

Kouhai•2y ago

Yeah, if Weird should be printed for odd numbers, then the test case above is invalid

shawski.OP•2y ago

im not sure how i can pass this problem then

shawski.OP•2y ago

Kouhai•2y ago

Can you show the description of the problem?

shawski.OP•2y ago

shawski.OP•2y ago

why is it giving me 2 answers? it isnt giving me an error or anything if that's what you mean

Kouhai•2y ago

No, I mean what are the requirements?

shawski.OP•2y ago

oh Task Given an integer, , perform the following conditional actions: If n is odd, print Weird If n is even and in the inclusive range of 2 to , 5 print Not Weird If n is even and in the inclusive range of 6 to , 20 print Weird If n is even and greater than 20, print Not Weird Print Weird if the number is weird; otherwise, print Not Weird.

shawski.OP•2y ago

shawski.OP•2y ago

wait i think there is a little bit more i have to do i didnt read this part If n is odd, print Weird If n is even and in the inclusive range of 2 to , 5 print Not Weird If n is even and in the inclusive range of 6 to , 20 print Weird If n is even and greater than 20, print Not Weird ok i have to nest some if statements. i know how to do this now alright i believe i fixed everything nvm...

If n is even and in the inclusive range of 6 to , 20 print Weird

If n is even and in the inclusive range of 6 to , 20 print Weird

shawski.OP•2y ago

from reading that, isnt this supposed to print 18

shawski.OP•2y ago

public static void Main(string[] args)
    {
        int N = Convert.ToInt32(Console.ReadLine().Trim());

        if (N % 2 == 0)
        {
            if (N < 2 && N > 5)
            {
                Console.WriteLine("Not Weird");
            }
            else if (N < 6 && N > 20)
            {
                Console.WriteLine("Weird");
            }
            else if (N > 20)
            {
                Console.WriteLine("Not Weird");
            }

        }
        else
        {
            Console.WriteLine("Weird");
        }
    }

public static void Main(string[] args)
    {
        int N = Convert.ToInt32(Console.ReadLine().Trim());

        if (N % 2 == 0)
        {
            if (N < 2 && N > 5)
            {
                Console.WriteLine("Not Weird");
            }
            else if (N < 6 && N > 20)
            {
                Console.WriteLine("Weird");
            }
            else if (N > 20)
            {
                Console.WriteLine("Not Weird");
            }

        }
        else
        {
            Console.WriteLine("Weird");
        }
    }

thats my updated code

Servator•2y ago

How can a number smaller than 6 yet bigger than 20 ?

shawski.OP•2y ago

oh wait i know what i need to do it should be || it's still failing 3/8 tests im not really sure what to do If n is even and in the inclusive range of 2 to , 5 print Not Weird

shawski.OP•2y ago

why is this wrong then?

Servator•2y ago

What's the problem exactly ? I mean assignment oh wait i saw mb

shawski.OP•2y ago

public static void Main(string[] args)
    {
        int N = Convert.ToInt32(Console.ReadLine().Trim());

        if (N % 2 == 0)
        {
            if (N < 2 || N > 5)
            {
                Console.WriteLine("Not Weird");
            }
            else if (N < 6 || N > 20)
            {
                Console.WriteLine("Weird");
            }
            else if (N > 20)
            {
                Console.WriteLine("Not Weird");
            }

        }
        else
        {
            Console.WriteLine("Weird");
        }

public static void Main(string[] args)
    {
        int N = Convert.ToInt32(Console.ReadLine().Trim());

        if (N % 2 == 0)
        {
            if (N < 2 || N > 5)
            {
                Console.WriteLine("Not Weird");
            }
            else if (N < 6 || N > 20)
            {
                Console.WriteLine("Weird");
            }
            else if (N > 20)
            {
                Console.WriteLine("Not Weird");
            }

        }
        else
        {
            Console.WriteLine("Weird");
        }

wait i see a couple mistakes i gtg for a little. i think i know how to solve it

Servator•2y ago

What is the expected result of 0 ? btw if number is expected in range (inclusive) It should be n >= 2 && n <= 5

        var result = (number, number % 2 == 0) switch
        {
            (_, false)             => "Weird",
            (>= 2 and <= 5, true)  => "Not Weird",
            (>= 6 and <= 20, true) => "Weird",
            (> 20, _)              => "Not Weird",
            _                      => "I don't know"
        };

        Console.WriteLine(result);

        var result = (number, number % 2 == 0) switch
        {
            (_, false)             => "Weird",
            (>= 2 and <= 5, true)  => "Not Weird",
            (>= 6 and <= 20, true) => "Weird",
            (> 20, _)              => "Not Weird",
            _                      => "I don't know"
        };

        Console.WriteLine(result);

shawski.OP•2y ago

yeah i mixed around the the greater than and less than symbols i havent seen a switched used like that hmm i thought it had to be

switch ()
{

}

switch ()
{

}

so result is a bool that checks if the number is % by 2 == 0 what does the underscore and "=>" mean i have seen those symbols but i dont really understand what they do

Servator•2y ago

It's lambda and switch expression so even numbers supposed to be Output "Weird" right ? sorry odd

shawski.OP•2y ago

yeah i think so

Servator•2y ago

        var result = number switch
        {
            _ when number % 2 != 0                             => "Weird",
            _ when number % 2 == 0 && number is >= 2 and <= 5  => "Not Weird",
            _ when number % 2 == 0 && number is >= 6 and <= 20 => "Weird",
            _ when number % 2 == 0 && number > 20              => "Not Weird",
            _                                                  => "I don't know"
        };

        var result = number switch
        {
            _ when number % 2 != 0                             => "Weird",
            _ when number % 2 == 0 && number is >= 2 and <= 5  => "Not Weird",
            _ when number % 2 == 0 && number is >= 6 and <= 20 => "Weird",
            _ when number % 2 == 0 && number > 20              => "Not Weird",
            _                                                  => "I don't know"
        };

can you try this ? If this doesnt work

        var result = number switch
        {
            _ when number % 2 == 0 && number is >= 2 and <= 5  => "Not Weird",
            _ when number % 2 == 0 && number is >= 6 and <= 20 => "Weird",
            _ when number % 2 == 0 && number > 20              => "Not Weird",
            _ when number % 2 != 0                             => "Weird",
            _                                                  => "I don't know"
        };

        var result = number switch
        {
            _ when number % 2 == 0 && number is >= 2 and <= 5  => "Not Weird",
            _ when number % 2 == 0 && number is >= 6 and <= 20 => "Weird",
            _ when number % 2 == 0 && number > 20              => "Not Weird",
            _ when number % 2 != 0                             => "Weird",
            _                                                  => "I don't know"
        };

This should work

shawski.OP•2y ago

i got past the problem a few hours ago i shouldve mentioned that

ero•2y ago

var result = number % 2 switch
{
  0 => number switch
  {
    (>= 2 and <= 5) or (> 20) => "Not Weird",
    _ => "Weird"
  },
  _ => "Weird"
};

var result = number % 2 switch
{
  0 => number switch
  {
    (>= 2 and <= 5) or (> 20) => "Not Weird",
    _ => "Weird"
  },
  _ => "Weird"
};

think this is more concise, at least to me

Servator•2y ago

Gaming

Programming

✅ need help with a problem