lc44.java

package code;
/*
 * 44. Wildcard Matching
 * 题意：通配符匹配
 * 难度：Hard
 * 分类：String, Dynamic Programming, Backtracking, Greedy
 * 思路：二维dp，和lc10很像，比lc10要简单一些。空间还可以压缩。
 * Tips：bingo
 */
public class lc44 {
    public static void main(String[] args) {
        System.out.println(isMatch("cb","?b"));
    }
    public static boolean isMatch(String s, String p) {
        boolean[][] dp = new boolean[s.length()+1][p.length()+1];
        dp[0][0] = true;
        char[] s_ch = s.toCharArray();
        char[] p_ch = p.toCharArray();
        for (int i = 0; i < p.length() ; i++) {
            if(p_ch[i]=='*') dp[0][i+1]=true;
            else break;
        }
        for (int i = 1; i <= s.length()  ; i++) {
            for (int j = 1; j <= p.length() ; j++) {
                if(s_ch[i-1]==p_ch[j-1] || p_ch[j-1]=='?') dp[i][j] = dp[i-1][j-1];
                if(p_ch[j-1]=='*') dp[i][j] = dp[i-1][j-1] || dp[i-1][j] || dp[i][j-1];
                //dp[i-1][j-1]  *任意第一个字符
                //dp[i-1][j]  *匹配后续任意
                //dp[i][j-1]  *匹配空
            }
        }
        return dp[s.length()][p.length()];
    }
}