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简单
1223
第 184 场周赛 Q1
数组
字符串
字符串匹配

English Version

题目描述

给你一个字符串数组 words ,数组中的每个字符串都可以看作是一个单词。请你按 任意 顺序返回 words 中是其他单词的子字符串的所有单词。

如果你可以删除 words[j] 最左侧和/或最右侧的若干字符得到 words[i] ,那么字符串 words[i] 就是 words[j] 的一个子字符串。

 

示例 1:

输入:words = ["mass","as","hero","superhero"]
输出:["as","hero"]
解释:"as" 是 "mass" 的子字符串,"hero" 是 "superhero" 的子字符串。
["hero","as"] 也是有效的答案。

示例 2:

输入:words = ["leetcode","et","code"]
输出:["et","code"]
解释:"et" 和 "code" 都是 "leetcode" 的子字符串。

示例 3:

输入:words = ["blue","green","bu"]
输出:[]

 

提示:

  • 1 <= words.length <= 100
  • 1 <= words[i].length <= 30
  • words[i] 仅包含小写英文字母。
  • 题目数据 保证 每个 words[i] 都是独一无二的。

解法

方法一:暴力枚举

我们直接枚举所有的字符串 $words[i]$,判断其是否为其他字符串的子串,如果是,将其加入答案。

时间复杂度 $O(n^3)$,空间复杂度 $O(n)$。其中 $n$ 为字符串数组的长度。

Python3

class Solution:
    def stringMatching(self, words: List[str]) -> List[str]:
        ans = []
        for i, s in enumerate(words):
            if any(i != j and s in t for j, t in enumerate(words)):
                ans.append(s)
        return ans

Java

class Solution {
    public List<String> stringMatching(String[] words) {
        List<String> ans = new ArrayList<>();
        int n = words.length;
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j) {
                if (i != j && words[j].contains(words[i])) {
                    ans.add(words[i]);
                    break;
                }
            }
        }
        return ans;
    }
}

C++

class Solution {
public:
    vector<string> stringMatching(vector<string>& words) {
        vector<string> ans;
        int n = words.size();
        for (int i = 0; i < n; ++i) {
            for (int j = 0; j < n; ++j) {
                if (i != j && words[j].find(words[i]) != string::npos) {
                    ans.push_back(words[i]);
                    break;
                }
            }
        }
        return ans;
    }
};

Go

func stringMatching(words []string) []string {
	ans := []string{}
	for i, w1 := range words {
		for j, w2 := range words {
			if i != j && strings.Contains(w2, w1) {
				ans = append(ans, w1)
				break
			}
		}
	}
	return ans
}

TypeScript

function stringMatching(words: string[]): string[] {
    const ans: string[] = [];
    const n = words.length;
    for (let i = 0; i < n; ++i) {
        for (let j = 0; j < n; ++j) {
            if (words[j].includes(words[i]) && i !== j) {
                ans.push(words[i]);
                break;
            }
        }
    }
    return ans;
}

Rust

impl Solution {
    pub fn string_matching(words: Vec<String>) -> Vec<String> {
        let mut ans = Vec::new();
        let n = words.len();
        for i in 0..n {
            for j in 0..n {
                if i != j && words[j].contains(&words[i]) {
                    ans.push(words[i].clone());
                    break;
                }
            }
        }
        ans
    }
}