zoukankan      html  css  js  c++  java
  • 44. Wildcard Matching 有简写的字符串匹配

    [抄题]:

    Given an input string (s) and a pattern (p), 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).

    Note:

    • s could be empty and contains only lowercase letters a-z.
    • p could be empty and contains only lowercase letters a-z, and characters like ? or *.

    Example 1:

    Input:
    s = "aa"
    p = "a"
    Output: false
    Explanation: "a" does not match the entire string "aa".
    

    Example 2:

    Input:
    s = "aa"
    p = "*"
    Output: true
    Explanation: '*' matches any sequence.
    

    Example 3:

    Input:
    s = "cb"
    p = "?a"
    Output: false
    Explanation: '?' matches 'c', but the second letter is 'a', which does not match 'b'.
    

    Example 4:

    Input:
    s = "adceb"
    p = "*a*b"
    Output: true
    Explanation: The first '*' matches the empty sequence, while the second '*' matches the substring "dce".
    

    Example 5:

    Input:
    s = "acdcb"
    p = "a*c?b"
    Output: false

     [暴力解法]:

    时间分析:

    空间分析:

     [优化后]:

    时间分析:

    空间分析:

    [奇葩输出条件]:

    [奇葩corner case]:

    初始化dp[0][j]的时候,除开一直是*的情况,都不能随意匹配 

    [思维问题]:

    搞不清楚和第十题的区别:就是能不能遗传 dp[i][j] = dp[i][j - 2]就行了

    [英文数据结构或算法,为什么不用别的数据结构或算法]:

    [一句话思路]:

    [输入量]:空: 正常情况:特大:特小:程序里处理到的特殊情况:异常情况(不合法不合理的输入):

    [画图]:

    [一刷]:

    1. dp[i][j - 1] 是重复一个字符的情况(其中包括了空字符),所以空字符不需要单独列出来

    [二刷]:

    [三刷]:

    [四刷]:

    [五刷]:

      [五分钟肉眼debug的结果]:

    [总结]:

    1. dp[i][j - 1] 是重复一个字符的情况(其中包括了空字符),所以空字符不需要单独列出来

    [复杂度]:Time complexity: O(mn) Space complexity: O(mn)

    [算法思想:递归/分治/贪心]:贪心

    [关键模板化代码]:

    for (int i = 1; i <= m; i++) {
                dp[i][0] = false;
            }
            
            for (int j = 1; j <= n; j++) {
                if (p.charAt(j - 1) == '*') dp[0][j] = true;
                else break;
            }

    [其他解法]:

    [Follow Up]:

    [LC给出的题目变变变]:

    10有前序的

     [代码风格] :

     [是否头一次写此类driver funcion的代码] :

    class Solution {
        public boolean isMatch(String s, String p) {
            //ini: dp[][]
            int m = s.length();
            int n = p.length();
            boolean[][] dp = new boolean[m + 1][n + 1];
            
            //cc: dp[0][0], dp[0][], dp[][0]
            dp[0][0] = true;
            
            for (int i = 1; i <= m; i++) {
                dp[i][0] = false;
            }
            
            for (int j = 1; j <= n; j++) {
                if (p.charAt(j - 1) == '*') dp[0][j] = true;
                else break;
            }
            
            //for loop: not * must equal or ., * 0 or more
            for (int i = 1; i <= m; i++) {
                for (int j = 1; j <= n; j++) 
                    if (p.charAt(j - 1) != '*') {
                        //1s
                        dp[i][j] = dp[i - 1][j - 1] && (s.charAt(i - 1) == p.charAt(j - 1) || p.charAt(j - 1) == '?');
                    }else {
                        //multiple s, 0 s
                        dp[i][j] = dp[i - 1][j] || dp[i][j - 1];
                    }
            }
            
            //return m n
            return  dp[m][n];
        }
    }
    View Code
  • 相关阅读:
    1012 The Best Rank (25 分)(排序)
    1011. World Cup Betting (20)(查找元素)
    1009 Product of Polynomials (25 分)(模拟)
    1008 Elevator (20 分)(数学问题)
    1006 Sign In and Sign Out (25 分)(查找元素)
    1005 Spell It Right (20 分)(字符串处理)
    Kafka Connect 出现ERROR Failed to flush WorkerSourceTask{id=local-file-source-0}, timed out while wait
    flume、kafka、avro组成的消息系统
    Java23种设计模式总结【转载】
    Java编程 思维导图
  • 原文地址:https://www.cnblogs.com/immiao0319/p/9081346.html
Copyright © 2011-2022 走看看