leetcode: regular expression match

太醜

bool isMatch(string s, string p) {
        vector<vector<bool> > dp(s.size() + 1, vector<bool>(p.size() + 1, false));
        dp[0][0] = true;
        for( int i = 1; i <= p.size(); ++i)
            dp[0][i] = '*' == p[i-1] && dp[0][i-2] && i > 1;
        for( int i = 1; i <= s.size(); ++i){
            for( int j = 1; j <= p.size(); ++j){
                    if(p[j-1] != '*')
                        dp[i][j] = dp[i-1][j-1] && (s[i-1] == p[j-1] || p[j-1] == '.');
                    else
                        dp[i][j] = dp[i-1][j] && (s[i-1] == p[j-2] || p[j-2] == '.') && j > 1 || dp[i][j-1] || dp[i][j-2] && j > 1;
            }
        }
        return dp[s.size()][p.size()];
    }