C#•3mo ago

Generate a unique number given two other numbers between -10 and 10

Is this possible? I cannot seem to figure out an equation that doesn't have collisions.

6 Replies

for this case the easiest way is to create dictionary that stores existing values or you want to make seed with 2 numbers?

ChezZ•3mo ago

I want to pass two numbers in and generate one single number

Salman•3mo ago

how do you want the single number to be generated using those two numbers ? Like what's the purpose of those two nums

MODiX•3mo ago

blueberriesiftheywerecats

REPL Result: Success

var used = new List<int>();

for (int i = -10; i <= 10; i++)
{
    for (int j = -10; j <= 10; j++)
    {
        used.Add(GenerateUniqueNumber(i, j));
    }
}

Console.WriteLine(used.Count == used.Distinct().Count());

int GenerateUniqueNumber(int a, int b)
{
    // Ensure numbers are within the range -10 to 10
    if (a < -10 || a > 10 || b < -10 || b > 10)
    {
        throw new ArgumentException("Numbers must be between -10 and 10");
    }

    // Map numbers from range -10 to 10 to a positive range for uniqueness
    int rangeOffset = 10; // Offset to map -10 to 0
    int mappedA = a + rangeOffset;
    int mappedB = b + rangeOffset;

    // Generate unique number using a combination formula
    int uniqueNumber = mappedA * 21 + mappedB; // 21 is the number of possible values for num2 (-10 to 10 inclusive)

    return uniqueNumber;
}

var used = new List<int>();

for (int i = -10; i <= 10; i++)
{
    for (int j = -10; j <= 10; j++)
    {
        used.Add(GenerateUniqueNumber(i, j));
    }
}

Console.WriteLine(used.Count == used.Distinct().Count());

int GenerateUniqueNumber(int a, int b)
{
    // Ensure numbers are within the range -10 to 10
    if (a < -10 || a > 10 || b < -10 || b > 10)
    {
        throw new ArgumentException("Numbers must be between -10 and 10");
    }

    // Map numbers from range -10 to 10 to a positive range for uniqueness
    int rangeOffset = 10; // Offset to map -10 to 0
    int mappedA = a + rangeOffset;
    int mappedB = b + rangeOffset;

    // Generate unique number using a combination formula
    int uniqueNumber = mappedA * 21 + mappedB; // 21 is the number of possible values for num2 (-10 to 10 inclusive)

    return uniqueNumber;
}

Console Output

True

True

Compile: 482.749ms | Execution: 51.678ms | React with ❌ to remove this embed.

blueberriesiftheywerecats•3mo ago

this seems to be working (chatgpt)

ChezZ•3mo ago

wait what thats generated by chat gpt? that works btw thank you

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Generate a unique number given two other numbers between -10 and 10