给定两个单词 word1 和 word2 ,返回使得 word1 和  word2 相同所需的最小步数。

每步 可以删除任意一个字符串中的一个字符。

示例 1:

输入: word1 = "sea", word2 = "eat"

输出: 2

解释: 第一步将 "sea" 变为 "ea" ,第二步将 "eat "变为 "ea"

示例  2:

输入:word1 = "leetcode", word2 = "etco"

输出:4


提示:

1 <= word1.length, word2.length <= 500

word1 和 word2 只包含小写英文字母

来源:力扣(LeetCode)

链接:https://leetcode-cn.com/problems/delete-operation-for-two-strings

著作权归领扣网络所有。商业转载请联系官方授权,非商业转载请注明出处。

/**
* @param {string} word1
* @param {string} word2
* @return {number}
*/
var minDistance = function(word1, word2) {
let dp = Array.from(new Array(word1.length + 1), () => new Array(word2.length + 1).fill(0));

for (let i = 1; i <= word1.length; i++) {
for (let j = 1; j <= word2.length; j++) {
if (word1[i-1] === word2[j-1]) {
dp[i][j] = dp[i-1][j-1] + 1;
}
else {
dp[i][j] = Math.max(dp[i-1][j], dp[i][j-1])
}
}
}
console.log(dp)
return word1.length + word2.length - 2*dp[word1.length][word2.length]
};