Comparing two different sized arrays

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I have two string arrays, one bigger than the other, and i need to check if any of the strings in the arrays are the same.

Posted 8-Mar-12 23:00pm

Jesper Schlütter

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OriginalGriff · Answer 1 · 2012-03-08T23:14:00

My preferred method would be to sort each array.
Then just compare with a single loop:

C#

If (string A > string B)
   move B
else if (string A < string B)
   move A
else 
   Same - record, and move A and B.

You can use Array.Sort to sort string arrays into order:

C#

string[] st = new string[] { "qwertyuiop", "asdfghjkl", "zxcvbnm" };
Array.Sort(st);

Oshtri Deka · Answer 2 · 2012-03-08T23:19:00

Try this:

C#

string[] array1, array2;
//list to store index's of same strings
List<keyvaluepair><int,int>> couplesList = new List<keyvaluepair><int,int>>();

//array creation goes here

//the algorithm 
for(int i = 0; i < array1.Length; i++)
{
    for(int j = 0; j < array2.Length; j++)
    {
        if(array1[i] == array2[j])
        {
           couplesList.Add(new KeyValuePair<int,int>(i,j));
        }
    }
}</keyvaluepair></keyvaluepair>

Silent Guardian · Answer 3 · 2012-03-09T08:11:00

I wud have done something like this:

C#

//smaller is the array with less no. of strings
//bigger is the array with more no. of strings

//this loop compares if any string in smaller is present in bigger
foreach(string i in smaller)
foreach(string j in bigger)
{
if(i==j)
Console.WriteLIne(i);//print the common string
}

Wes Aday · Answer 4 · 2012-03-09T08:40:00

Solution 4

A LINQ solution:

C#

string[] test = new string[] { "one", "two", "three" };
string[] test1 = new string[] { "four", "six", "eight", "ten", "one" };

string[] result = test.Intersect(test1).ToArray();

result contains the strings that are the same in both arrays.

Posted 9-Mar-12 8:40am

Wes Aday

Comparing two different sized arrays

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