memoization example

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const fib = (n, memo) => {
    memo = memo || {}

    if (memo[n]) return memo[n]

    if (n <= 1) return 1
    return memo[n] = fib(n-1, memo) + fib(n-2, memo)
}

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Source: www.freecodecamp.org

Tags: javascript memoization

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Contributed on Nov 06 2024

Arthur M

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memoization

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Memoization is a programming technique that accelerates performance by caching the return values of expensive function calls.

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Source: Grepper

Tags: memoization memo

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Contributed on Nov 25 2022

paramjeetdhiman

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you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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if (sb.ToString().Contains(stringtofind)) {
  // stringtofind is found in sb
} else {
  // stringtofind is not found in sb
}

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Source: Grepper

Tags: c# identify named object string str

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Contributed on Jan 10 2023

Muiz Ather

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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/** There are a number of ways to accomplish that
    1) Use the default StringBuilder function `IndexOf`
    2) Another way is to implement a fast search algorithm `Knuth-Morris-Pratt (KMP) algorithm,
       which is an efficient string searching algorithm that works by precomputing a partial
       match table based on the pattern to be searched.
       The KMP algorithm has a time complexity of O(n+m), where n is the length of the text
       to be searched and m is the length of the pattern to be searched.
   .
   .
   .
  Here's an example implementation of the KMP algorithm in C#:
**/


public static int KMP(string text, string pattern)
{
    int n = text.Length;
    int m = pattern.Length;

    int[] pi = ComputePrefix(pattern);

    int j = 0;
    for (int i = 0; i < n; i++)
    {
        while (j > 0 && pattern[j] != text[i])
        {
            j = pi[j - 1];
        }
        if (pattern[j] == text[i])
        {
            j++;
        }
        if (j == m)
        {
            return i - m + 1;
        }
    }
    return -1;
}

private static int[] ComputePrefix(string pattern)
{
    int m = pattern.Length;
    int[] pi = new int[m];

    int j = 0;
    for (int i = 1; i < m; i++)
    {
        while (j > 0 && pattern[j] != pattern[i])
        {
            j = pi[j - 1];
        }
        if (pattern[j] == pattern[i])
        {
            j++;
        }
        pi[i] = j;
    }

    return pi;
}


// To use the above code to search for a string within a StringBuilder object,
// you can simply call the KMP method with the ToString() method of the
// StringBuilder object and the string you want to search for:


StringBuilder sb = new StringBuilder(reallylongstring);
string stringtofind = "some string";
int index = KMP(sb.ToString(), stringtofind);

if (index != -1)
{
    Console.WriteLine("The string '{0}' is found at index {1}.", stringtofind, index);
}
else
{
    Console.WriteLine("The string '{0}' is not found.", stringtofind);
}

// Note:
//      that the ToString() method is called to convert the StringBuilder
//      object to a string before passing it to the KMP method.

// https://www.geeksforgeeks.org/kmp-algorithm-for-pattern-searching/

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Source: www.geeksforgeeks.org

Tags: algorithm algo

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Contributed on Mar 03 2023

Mckynde

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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public static class StringBuilderSearching
{
  public static bool Contains(this StringBuilder haystack, string needle)
  {
    return haystack.IndexOf(needle) != -1;
  }
  public static int IndexOf(this StringBuilder haystack, string needle)
  {
    if(haystack == null || needle == null)
      throw new ArgumentNullException();
    if(needle.Length == 0)
      return 0;//empty strings are everywhere!
    if(needle.Length == 1)//can't beat just spinning through for it
    {
      char c = needle[0];
      for(int idx = 0; idx != haystack.Length; ++idx)
        if(haystack[idx] == c)
          return idx;
      return -1;
    }
    int m = 0;
    int i = 0;
    int[] T = KMPTable(needle);
    while(m + i < haystack.Length)
    {
      if(needle[i] == haystack[m + i])
      {
        if(i == needle.Length - 1)
          return m == needle.Length ? -1 : m;//match -1 = failure to find conventional in .NET
        ++i;
      }
      else
      {
        m = m + i - T[i];
        i = T[i] > -1 ? T[i] : 0;
      }
    }
    return -1;
  }      
  private static int[] KMPTable(string sought)
  {
    int[] table = new int[sought.Length];
    int pos = 2;
    int cnd = 0;
    table[0] = -1;
    table[1] = 0;
    while(pos < table.Length)
      if(sought[pos - 1] == sought[cnd])
        table[pos++] = ++cnd;
      else if(cnd > 0)
        cnd = table[cnd];
      else
        table[pos++] = 0;
    return table;
  }
}

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Source: stackoverflow.com

Tags: c#

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Contributed on May 05 2022

What

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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You can use the StringBuilder.IndexOf() method to check if the stringtofind is contained within the StringBuilder object. Here is an example of how you can use it:if (sb.IndexOf(stringtofind) >= 0)
{
    // stringtofind was found within sb
}
else
{
    // stringtofind was not found within sb
}
Alternatively, you can also use the StringBuilder.ToString() method to convert the StringBuilder object to a string and use the String.Contains() method to check if the stringtofind is contained within the string. Here is an example of how you can use it:

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Source: Grepper

Tags: c# identify named object

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Contributed on Jan 03 2023

Hustler

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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// You can use the StringBuilder.IndexOf(string) method to find the index of the first occurrence of the stringtofind string within the sb StringBuilder object.
// 
// Here is an example of how to use this method:
int index = sb.IndexOf(stringtofind);
if (index >= 0)
{
    // stringtofind was found within sb
}
else
{
    // stringtofind was not found within sb
}

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Source: Grepper

Tags: c# identify named object objec

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Contributed on Jan 04 2023

SnefDen

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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if (sb.IndexOf(stringtofind) >= 0)
{
   // stringtofind was found in sb
}
else
{
   // stringtofind was not found in sb
}


//OR


if (sb.Contains(stringtofind))
{
   // stringtofind was found in sb
}
else
{
   // stringtofind was not found in sb
}

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Source: programely.com

Tags: c# identify named object o

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Contributed on Jan 08 2023

HINDI Tech

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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There are a few different ways to check if a string stored in an object named "stringtofind" is within the StringBuilder "sb" object in C#, but one common way is to use the IndexOf method:

if (sb.ToString().IndexOf(stringtofind) != -1)
{
    // The stringtofind was found within the sb object
}

Another way is using Contains method

if (sb.ToString().Contains(stringtofind))
{
    // The stringtofind was found within the sb object
}


Both methods works the same but the way they indicate if the string is found is different.
The IndexOf method will return -1 if the string is not found, otherwise it returns the index of the first occurrence of the specified string. The Contains method returns a Boolean indicating whether the specified string occurs within this object.

In both cases, you're calling the ToString() method on the sb object, which converts it to a regular string so you can use the IndexOf or Contains method on it.

It's important to keep in mind that the IndexOf and Contains method are case-sensitive, if you want to check the string with ignoring the case, you can use IndexOf or Contains method along with String.Compare method with 'StringComparison.OrdinalIgnoreCase' option.

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Source: Grepper

Tags: c# identify named object objec

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Contributed on Jan 10 2023

Ranger

0 Answers Avg Quality 2/10

you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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0

You can use the StringBuilder.IndexOf(string) method to check if the stringtofind is within the StringBuilder object sb.

Here's an example:

string stringtofind = "findme";
int index = sb.ToString().IndexOf(stringtofind);
if (index >= 0) {
    Console.WriteLine("The string '{0}' was found in the StringBuilder at index {1}.", stringtofind, index);
} else {
    Console.WriteLine("The string '{0}' was not found in the StringBuilder.", stringtofind);
}


You can call the .ToString() Method of the stringbuilder to get the value of the stringbuilder to perform the search.

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Source: Grepper

Tags: c# identify named object objec

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Contributed on Jan 11 2023

Barkerbg001

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you have the following c# code. stringbuilder sb = new stringbuilder(reallylongstring); the reallylongstring variable is a string in which a very long string is stored. you need to identify whether a string stored in an object named stringtofind is within

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#Use String Class built in method ToString().Contains($ARGC*)  To find a substring 
sb.ToString().Contains(stringtofind);

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Source: Grepper

Tags: c# c++ identify named object objec

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Contributed on Jan 19 2023

Mighty Morphin Powder Strangers

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memoization example

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