https://oj.leetcode.com/problems/wildcard-matching/

模拟通配符的匹配

做法非常好

 class Solution {
public:
bool isMatch(const char *s, const char *p) {
bool hasStar = false;
const char *str,*ptr;
for(str = s,ptr = p; *str != '\0'; str++,ptr++)
{
switch(*ptr)
{
// 相当于做了一次匹配,都往前走1
case '?':
break;
case '*':
hasStar = true;
s = str; // 记录,前面的已经处理好了
p = ptr;
while(*p == '*') p++; // 相当于把*先映射成空
if(*p == '\0')
return true;
str = s - ;
ptr = p - ;
break;
default:
if(*str != *ptr)
{
if(!hasStar)
return false;
s++; // s往前挪一个,相当于 * 多映射一个 回到出现*的位置开始 再往前加一个 再进行下面的匹配
str = s -;
ptr = p -;
}
}
}
while(*ptr == '*')
ptr++;
return (*ptr == '\0');
}
};

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