class Solution {
public int minDistance(String word1, String word2) {
int[][] dp = new int[word1.length()+1][word2.length()+1];
for (int i = 0; i < word1.length() + 1; i++) {
dp[i][0] = i;
}
for (int j = 0; j < word2.length() + 1; j++) {
dp[0][j] = j;
}
for(int i = 1; i < word1.length()+1; i++) {
for(int j = 1;j < word2.length()+1;j++) {
if(word1.charAt(i-1) == word2.charAt(j-1)) {
dp[i][j] = dp[i - 1][j - 1];
}else {
dp[i][j] = Math.min(dp[i-1][j-1]+2, Math.min(dp[i-1][j]+1, dp[i][j-1] + 1));
}
}
}
return dp[word1.length()][word2.length()];
}
}
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