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24 lines
765 B
C
24 lines
765 B
C
module levenshtein;
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func int levenshtein(String s, String t)
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{
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// if either string is empty, difference is inserting all chars
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// from the other
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if (!s.len) return t.len;
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if (!t.len) return s.len;
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// if last letters are the same, the difference is whatever is
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// required to edit the rest of the strings
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if (s[^1] == t[^1]) return levenshtein(s[0..^2], t[0..^2]);
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// else try:
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// changing last letter of s to that of t; or
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// remove last letter of s; or
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// remove last letter of t,
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// any of which is 1 edit plus editing the rest of the strings
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int a = levenshtein(s[0..^2], t[0..^2]);
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int b = levenshtein(s, t[0..^2]);
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int c = levenshtein(s[0..^2], t);
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return @max(@max(a, b), c) + 1;
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} |