leetcode-72. 编辑距离

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class Solution {
    public int minDistance(String word1, String word2) {
        int n1 = word1.length();
        int n2 = word2.length();
        int[][] dp = new int[n1 + 1][n2 + 1];
		
        //初始化行
        for (int i = 0; i <= n1; i++) {
            dp[i][0] = i;
        }
		//初始化列
        for (int i = 0; i <= n2; i++) {
            dp[0][i] = i;
        }

        for (int i = 1; i <= n1; i++) {
            for (int j = 1; j <= n2; 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], Math.min(dp[i][j - 1], dp[i - 1][j - 1])) + 1;
                }
            }
        }

        return dp[n1][n2];
    }
}