import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        while (in.hasNext()) {
            String s = in.nextLine();
            System.out.println(getResult(s));
        }
    }
    public static int getResult(String s) {
        int len = s.length();
        String res = new StringBuffer(s).reverse().toString();
        int[][] data = http://www.mamicode.com/new int[len + 1][len + 1];
        for (int i = 0; i < len + 1; i++) {
            data[i][0] = data[0][i] = 0;
        }
        for (int i = 1; i < len + 1; i++) {
            for (int j = 1; j < len + 1; j++) {
                if (s.charAt(i - 1) == res.charAt(j - 1)) {
                    data[i][j] = data[i - 1][j - 1] + 1;
                } else if (data[i - 1][j] >= data[i][j - 1]) {
                    data[i][j] = data[i - 1][j];
                } else
                    data[i][j] = data[i][j - 1];
            }
        }
        return len - data[len][len];
    }
}

测试代码插件