题解 | #计算字符串的编辑距离#

import java.util.Scanner;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        String firstLine = in.nextLine();
        String secondLine = in.nextLine();
        char[] charsA = firstLine.toCharArray();
        char[] charsB = secondLine.toCharArray();
        int[][] dp = new int[charsA.length + 1][charsB.length + 1];
        for (int i = 0; i <= charsB.length; i++) {
            dp[0][i] = i;
        }
        for (int j = 0; j <= charsA.length; j++) {
            dp[j][0] = j;
        }
        for (int i = 1; i <= charsA.length; i++) {
            for (int j = 1; j <= charsB.length; j++) {
                if (charsA[i - 1] == charsB[j - 1]) {
                    dp[i][j] = dp[i - 1 ][j - 1];
                } else {
                    int min = Math.min(dp[i - 1][j - 1 ], dp [i - 1][j]);
                    dp[i][j] = Math.min(min, dp[i][j - 1]) + 1;
                }
            }
        }
        System.out.println(dp[charsA.length][charsB.length]);
    }
}