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33 lines
716 B
C++
33 lines
716 B
C++
#include <Common/levenshteinDistance.h>
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#include <Common/PODArray.h>
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namespace DB
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{
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size_t levenshteinDistance(const String & lhs, const String & rhs)
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{
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size_t m = lhs.size();
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size_t n = rhs.size();
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PODArrayWithStackMemory<size_t, 64> row(n + 1);
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for (size_t i = 1; i <= n; ++i)
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row[i] = i;
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for (size_t j = 1; j <= m; ++j)
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{
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row[0] = j;
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size_t prev = j - 1;
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for (size_t i = 1; i <= n; ++i)
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{
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size_t old = row[i];
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row[i] = std::min(prev + (std::tolower(lhs[j - 1]) != std::tolower(rhs[i - 1])),
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std::min(row[i - 1], row[i]) + 1);
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prev = old;
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}
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}
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return row[n];
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}
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}
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