# Levenshtein Distance

Levenshtein distance is a string metric for measuring the difference between two sequences. Informally, the Levenshtein distance between two words is the minimum number of single-character edits (i.e. insertions, deletions or substitutions) required to change one word into the other. It is named after Vladimir Levenshtein, who considered this distance in 1965.

` ````
private static uint MIN3(uint a, uint b, uint c)
{
return ((a) < (b) ? ((a) < (c) ? (a) : (c)) : ((b) < (c) ? (b) : (c)));
}
public static int LevenshteinDistance(string s1, string s2)
{
uint s1len, s2len, x, y, lastdiag, olddiag;
s1len = (uint)s1.Length;
s2len = (uint)s2.Length;
uint[] column = new uint[s1len + 1];
for (y = 1; y <= s1len; ++y)
column[y] = y;
for (x = 1; x <= s2len; ++x)
{
column[0] = x;
for (y = 1, lastdiag = x - 1; y <= s1len; ++y)
{
olddiag = column[y];
column[y] = MIN3(column[y] + 1, column[y - 1] + 1, (uint)(lastdiag + (s1[(int)(y - 1)] == s2[(int)(x - 1)] ? 0 : 1)));
lastdiag = olddiag;
}
}
return (int)(column[s1len]);
}
```

### Example

` ``int result = LevenshteinDistance("kitten", "sitting");`

### Output

` ``result: 3`