LeetCode 044 Wildcard Matching

题目

字符串匹配 “." 匹配任意字符串  “？”匹配单个字符串

代码

public class Solution {
public boolean isMatch(String s, String p) {
int m = s.length(), n = p.length();
int count = 0;
for (int i = 0; i < n; i++) {
if (p.charAt(i) == '*') count++;
}
if (count==0 && m != n) return false;
else if (n - count > m) return false;

boolean[] match = new boolean[m+1];
match[0] = true;
for (int i = 0; i < m; i++) {
match[i+1] = false;
}
for (int i = 0; i < n; i++) {
if (p.charAt(i) == '*') {
for (int j = 0; j < m; j++) {
match[j+1] = match[j] || match[j+1];
}
} else {
for (int j = m-1; j >= 0; j--) {
match[j+1] = (p.charAt(i) == '?' || p.charAt(i) == s.charAt(j)) && match[j];
}
match[0] = false;
}
}
return match[m];
}
}
思路

DP的字典记录。

record[j]代表 j和到第i个字符的字符串是否能够匹配。