实现Oracle的编辑距离相似度函数，用C语言实现

以下是C++实现

#include <iostream>
#include <cstring>
#include <algorithm>
using namespace std;

const int maxn = 1e3 + 5;

int ed[maxn][maxn];

int min(int a, int b, int c) {
    return min(min(a, b), c);
}

double edit_dist(char* s1, char* s2) {
    int len1 = strlen(s1);
    int len2 = strlen(s2);

    ed[0][0] = 0;
    for (int i = 1; i <= len1; i++) ed[i][0] = i;
    for (int j = 1; j <= len2; j++) ed[0][j] = j;

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

    int max_len = max(len1, len2);
    return 1 - 1.0 * ed[len1][len2] / max_len;
}

int main() {
    char s1[maxn], s2[maxn];
    while (cin >> s1 >> s2) {
        printf("%.2f\n", edit_dist(s1, s2));
    }

    return 0;
}