Cockatrice/libcockatrice_utility/libcockatrice/utility/levenshtein.cpp

#include "levenshtein.h"

#include <algorithm>
#include <vector>

int levenshteinDistance(const QString &s1, const QString &s2)
{
    int len1 = s1.size();
    int len2 = s2.size();
    std::vector<std::vector<int>> dp(len1 + 1, std::vector<int>(len2 + 1));

    for (int i = 0; i <= len1; i++) {
        dp[i][0] = i;
    }
    for (int j = 0; j <= len2; j++) {
        dp[0][j] = j;
    }

    for (int i = 1; i <= len1; i++) {
        for (int j = 1; j <= len2; j++) {
            int cost = (s1[i - 1] == s2[j - 1]) ? 0 : 1;
            dp[i][j] = std::min({dp[i - 1][j] + 1, dp[i][j - 1] + 1, dp[i - 1][j - 1] + cost});
        }
    }

    return dp[len1][len2];
}