//

// Created by Ruizhe Hou on 2020/9/26.

//

#include <vector>

#include <string>

using namespace std;

class Solution {

public:

/**

* @param words: a set of stirngs

* @param target: a target string

* @param k: An integer

* @return: output all the strings that meet the requirements

*/

int minDistance(string word1, string word2, int k) {

int m = word1.size();

int n = word2.size();

if (m - n > k || n - m > k) return k + 1;

vector<vector<int>> dp(m + 1, vector<int>(n + 1));

for (int i = 0; i <= m; i++) {

dp[i][0] = i;

}

for (int j = 0; j <= n; j++) {

dp[0][j] = j;

}

for (int i = 1; i <= m; i++) {

for (int j = 1; j <= n; j++) {

if (word1[i - 1] == word2[j - 1])

dp[i][j] = dp[i - 1][j - 1];

else {

dp[i][j] = 1 + min(dp[i - 1][j - 1], min(dp[i][j - 1], dp[i - 1][j]));

}

}

}

return dp[m][n];

}

vector<string> kDistance(vector<string> &words, string &target, int k) {

// write your code here

vector<string> res;

for (auto &word: words) {

if (minDistance(word, target, k) <= k) {

res.push_back(word);

}

}

return res;

}

};