Java for LeetCode 044 Wildcard Matching
Implement wildcard pattern matching with support for '?' and '*'.
'?' Matches any single character.
'*' Matches any sequence of characters (including the empty sequence). The matching should cover the entire input string (not partial). The function prototype should be:
bool isMatch(const char *s, const char *p) Some examples:
isMatch("aa","a") → false
isMatch("aa","aa") → true
isMatch("aaa","aa") → false
isMatch("aa", "*") → true
isMatch("aa", "a*") → true
isMatch("ab", "?*") → true
isMatch("aab", "c*a*b") → false
解题思路一:
参考之前写的Java for LeetCode 010 Regular Expression Matching,可以很轻松的用递归写出代码,JAVA实现如下:
static public boolean isMatch(String s, String p) {
if(s.length()==0){
for(int i=0;i<p.length();i++)
if(p.charAt(i)!='*')
return false;
return true;
}
if (p.length() == 0)
return s.length() == 0;
else if (p.length() == 1)
return p.charAt(0)=='*'||(s.length() == 1&& (p.charAt(0) == '?' || s.charAt(0) == p.charAt(0)));
if(p.charAt(0)!='*'){
if(p.charAt(0)!=s.charAt(0)&&p.charAt(0)!='?')
return false;
return isMatch(s.substring(1),p.substring(1));
}
int index=0;
while(index<p.length()){
if(p.charAt(index)=='*')
index++;
else break;
}
if(index==p.length())
return true;
p=p.substring(index);
for(int i=0;i<s.length();i++){
if(isMatch(s.substring(i),p))
return true;
}
return false;
}
结果Time Limit Exceeded!也就是说这种类似暴力枚举的算法肯定不能通过!
解题思路二:
static public boolean isMatch(String s, String p) {
int indexS=0,indexP=0,starIndex=-2,sPosition=-2;
while(indexS<s.length()){
if(starIndex==p.length()-1)
return true;
if(indexP>=p.length()){
if(starIndex<0)
return false;
indexP=starIndex+1;
indexS=++sPosition;
}
if(s.charAt(indexS)==p.charAt(indexP)||p.charAt(indexP)=='?'){
indexS++;
indexP++;
}
else if(p.charAt(indexP)=='*'){
starIndex=indexP++;
sPosition=indexS;
}
else if(starIndex>=0){
indexP=starIndex+1;
indexS=++sPosition;
}
else return false;
}
while(indexP<p.length()){
if(p.charAt(indexP)!='*')
return false;
indexP++;
}
return true;
}
Java for LeetCode 044 Wildcard Matching的更多相关文章
- LeetCode 044 Wildcard Matching
题目要求:Wildcard Matching Implement wildcard pattern matching with support for '?' and '*'. '?' Matches ...
- 【leetcode】Wildcard Matching
Wildcard Matching Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any ...
- LeetCode - 44. Wildcard Matching
44. Wildcard Matching Problem's Link --------------------------------------------------------------- ...
- [LeetCode] 44. Wildcard Matching 外卡匹配
Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '? ...
- 【leetcode】Wildcard Matching(hard) ★ 大神太牛了
Implement wildcard pattern matching with support for '?' and '*'. '?' Matches any single character. ...
- [leetcode]44. Wildcard Matching万能符匹配
Given an input string (s) and a pattern (p), implement wildcard pattern matching with support for '? ...
- LeetCode题解-----Wildcard Matching
题目描述: '?' Matches any single character. '*' Matches any sequence of characters (including the empty ...
- LeetCode 44 Wildcard Matching(字符串匹配问题)
题目链接:https://leetcode.com/problems/wildcard-matching/?tab=Description '?' Matches any single chara ...
- 044 Wildcard Matching 通配符匹配
实现一个支持 '?' 和 '*' 的通配符匹配.'?' 匹配任何单个字符.'*' 匹配任何数量的字符 (包括0个).匹配应覆盖 整个 输入字符串(而不是部分).这个函数原型为:bool isMatch ...
随机推荐
- web前端开发常用的10个高端CSS UI开源框架
web前端开发常用的10个高端CSS UI开源框架 随着人们对体验的极致追求,web页面设计也面临着新的挑战,不仅需要更人性化的设计理念,还需要设计出更酷炫的页面.作为web前端开发人员,运用开源 ...
- PHP局部变量与全局变量
一.局部变量定义:在函数内部声明,且只能在函数内部调用的变量. 注意:参数也是局部变量的一种. demo1:1 function demo1(){2 $age = 10;3 }4 5 echo ...
- POJ3020Antenna Placement(最小路径覆盖+重在构图)
Antenna Placement Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 7788 Accepted: 3880 ...
- c#中的23种设计模式
C# 23种设计模式汇总 创建型模式 工厂方法(Factory Method) 在工厂方法模式中,工厂方法用来创建客户所需要的产品,同时还向客户隐藏了哪种具体产品类将被实例化这一细节.工厂方法模式的核 ...
- 初学Hibernate之Query扩展
1.hql参数化查询,不明确值类型的用setParameter方法:明确查询结果为一条记录的用uniqueResult方法查询 注意,参数化查询中方法setString 或 setParameter如 ...
- VS2010+OpenCV2.4.6永久性配置方法
1. 配置OpenCV环境变量 计算机->(右键)属性,出现如图1所示界面 单击“高级系统设置”,选中高级(标签)出现如图2所示界面 单击右下方的“环境变量”,弹出如图3所示界面,注意这里最好用 ...
- unity3d DefineManager 全局宏定义
/** * Editor Wizard for easily managing global defines in Unity * Place in Assets/Editor folder, or ...
- 锋利的jQuery-4--trigger()和triggerHandler()
trigger()方法触发事件后,会执行浏览器默认操作. $("input").trigger("focus") 以上的代码不仅会执行input绑定的focus ...
- css 文字换行
换行word-wrap: break-word 新起一行对长单词进行断句word-break:break-all 本行对长单词进行断句 不换行,强制一行white-space:nowrap table ...
- WPF 组合快捷键
if(e.KeyStates == Keyboard.GetKeyStates(Key.F4) && Keyboard.Modifiers == ModifierKeys.Alt) { ...