524. Longest Word in Dictionary through Deleting

本文介绍了一种算法,该算法可以在给定的字符串中找到字典中最长的匹配字符串。通过遍历字典中的每个单词并与目标字符串进行比较,实现逐字符匹配。最终返回最长且字典序最小的匹配字符串。

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Given a string and a string dictionary, find the longest string in the dictionary that can be formed by deleting some characters of the given string. If there are more than one possible results, return the longest word with the smallest lexicographical order. If there is no possible result, return the empty string.

Example 1:
Input:
s = “abpcplea”, d = [“ale”,”apple”,”monkey”,”plea”]

Output:
“apple”
这道题就是先把每一个d内的单词和s的字母比较,s的每一次比较索引都要i++,而d只需要在和s找到一样的字母才需要,每次一次遍历结束后,都要把rel和d[index]进行比较,如果长度是rel比较短,则要更新rel,如果rel长度和d[index]相等,且rel的字典序比d[index]的大,则也要更新rel。
代码如下:

class Solution {
public:
    string findLongestWord(string s, vector<string>& d) {
        string rel="";
        for(int index=0;index<d.size();index++){
            int i=0,j=0;
            for(;i<s.size()&&j<d[index].size();i++){
                if(s[i]==d[index][j])j++;
            }
            if(d[index].size()==j&&((rel.size()<d[index].size())||(rel.size()==d[index].size()&&rel>d[index]))){
                rel=d[index];
            }
        }
        return rel;
    }
};
返回的错误为Trying: longest_word(['cat','dog','bird']) Expecting: 'bird' ********************************************************************** File "e:\Learn AI-Assisted Python Programming,Second Edition translation\code6.3.py", line 7, in __main__.longest_word Failed example: longest_word(['cat','dog','bird']) Expected: 'bird' Got: 'bird' Trying: longest_word(['happy','birthday','my','cat']) Expecting: 'birthday' ********************************************************************** File "e:\Learn AI-Assisted Python Programming,Second Edition translation\code6.3.py", line 9, in __main__.longest_word Failed example: longest_word(['happy','birthday','my','cat']) Expected: 'birthday' Got: 'birthday' Trying: longest_word(['happy']) Expecting: 'happy' ********************************************************************** File "e:\Learn AI-Assisted Python Programming,Second Edition translation\code6.3.py", line 11, in __main__.longest_word Failed example: longest_word(['happy']) Expected: 'happy' Got: 'happy' Trying: longest_word(['cat','dog','me']) Expecting: 'cat' ********************************************************************** File "e:\Learn AI-Assisted Python Programming,Second Edition translation\code6.3.py", line 13, in __main__.longest_word Failed example: longest_word(['cat','dog','me']) Expected: 'cat' Got: 'cat' Trying: longest_word(['','']) Expecting: '' ********************************************************************** File "e:\Learn AI-Assisted Python Programming,Second Edition translation\code6.3.py", line 15, in __main__.longest_word Failed example: longest_word(['','']) Expected: '' Got: '' 1 items had no tests: __main__ ********************************************************************** 1 items had failures: 5 of 5 in __main__.longest_word 5 tests in 2 items. 0 passed and 5 failed. ***Test Failed*** 5 failures.
最新发布
08-17
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