最小编辑距离。

public int minDistance(String word1, String word2) {

        char[] wc1 = word1.toCharArray();
        char[] wc2 = word2.toCharArray();

        int[][] result = new int[wc1.length + 1][wc2.length + 1];

        for (int i = 0; i <= wc1.length; i++) {
            result[i][0] = i;
        }

        for (int j = 0; j <= wc2.length; j++) {
            result[0][j] = j;
        }

        for (int i = 1; i <= wc1.length; i++) {

            for (int j = 1; j <= wc2.length; j++) {

                if (wc1[i - 1] == wc2[j - 1]) {
                    result[i][j] = result[i - 1][j - 1];

                } else {
                    result[i][j] = Math.min(Math.min(result[i - 1][j], result[i][j - 1]), result[i - 1][j - 1]) + 1;
                }

            }

        }

        return result[wc1.length][wc2.length];

    }