leetcode-----72. 编辑距离

• 链接：https://leetcode-cn.com/problems/edit-distance/

代码

class Solution {
public:
    int minDistance(string word1, string word2) {
        int n = word1.size(), m = word2.size();
        word1 = ' ' + word1, word2 = ' ' + word2;
        vector<vector<int>> f(n + 1, vector<int>(m + 1));

        for (int i = 0; i <= n; ++i) f[i][0] = i;
        for (int i = 0; i <= m; ++i) f[0][i] = i;

        for (int i = 1; i <= n; ++i) {
            for (int j = 1; j <= m; ++j) {
                f[i][j] = min(f[i - 1][j], f[i][j - 1]) + 1;
                int t = word1[i] != word2[j];
                f[i][j] = min(f[i][j], f[i - 1][j - 1] + t);
            }
        }
        return f[n][m];
    }
};