leetcode——72.编辑距离

import static java.lang.Integer.min;
class Solution {
    public int minDistance(String word1, String word2) {
        int m = word1.length();
        int n = word2.length();
        int[][] dp = new int[m+1][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.charAt(i-1) == word2.charAt(j-1)){
                    dp[i][j] = dp[i-1][j-1];
                }else{
                    dp[i][j] = min(dp[i-1][j-1],min(dp[i][j-1],dp[i-1][j]))+1;
                }
            }
        }
        return dp[m][n];
    }
}