两个字符串的删除操作

class Solution {
public:
    int minDistance(string word1, string word2) {
        vector<vector<int>> dp(word1.size()+1, vector<int>(word2.size()+1, 0));
        for(int i=1;i<=word1.size();i++){
            for(int j=1;j<=word2.size();j++){
                if(word1[i-1]==word2[j-1]) dp[i][j]=dp[i-1][j-1]+1;
                else dp[i][j]=max(dp[i][j-1],dp[i-1][j]);
            }
        }
        return word1.size()+word2.size()-2*dp[word1.size()][word2.size()];
    }
};