leet-code/src/main/java/leetcode/editor/cn/SearchSuggestionsSystem.java

//给你一个产品数组 products 和一个字符串 searchWord ，products 数组中每个产品都是一个字符串。 
//
// 请你设计一个推荐系统，在依次输入单词 searchWord 的每一个字母后，推荐 products 数组中前缀与 searchWord 相同的最多三个产品
//。如果前缀相同的可推荐产品超过三个，请按字典序返回最小的三个。 
//
// 请你以二维列表的形式，返回在输入 searchWord 每个字母后相应的推荐产品的列表。 
//
// 
//
// 示例 1： 
//
// 输入：products = ["mobile","mouse","moneypot","monitor","mousepad"], searchWord 
//= "mouse"
//输出：[
//["mobile","moneypot","monitor"],
//["mobile","moneypot","monitor"],
//["mouse","mousepad"],
//["mouse","mousepad"],
//["mouse","mousepad"]
//]
//解释：按字典序排序后的产品列表是 ["mobile","moneypot","monitor","mouse","mousepad"]
//输入 m 和 mo，由于所有产品的前缀都相同，所以系统返回字典序最小的三个产品 ["mobile","moneypot","monitor"]
//输入 mou， mous 和 mouse 后系统都返回 ["mouse","mousepad"]
// 
//
// 示例 2： 
//
// 输入：products = ["havana"], searchWord = "havana"
//输出：[["havana"],["havana"],["havana"],["havana"],["havana"],["havana"]]
// 
//
// 示例 3： 
//
// 输入：products = ["bags","baggage","banner","box","cloths"], searchWord = 
//"bags"
//输出：[["baggage","bags","banner"],["baggage","bags","banner"],["baggage","bags"]
//,["bags"]]
// 
//
// 示例 4： 
//
// 输入：products = ["havana"], searchWord = "tatiana"
//输出：[[],[],[],[],[],[],[]]
// 
//
// 
//
// 提示： 
//
// 
// 1 <= products.length <= 1000 
// 1 <= Σ products[i].length <= 2 * 10^4 
// products[i] 中所有的字符都是小写英文字母。 
// 1 <= searchWord.length <= 1000 
// searchWord 中所有字符都是小写英文字母。 
// 
// Related Topics 字典树 数组 字符串 👍 84 👎 0

package leetcode.editor.cn;

import java.util.*;

//1268:搜索推荐系统
class SearchSuggestionsSystem {
    public static void main(String[] args) {
        //测试代码
        Solution solution = new SearchSuggestionsSystem().new Solution();
        solution.suggestedProducts(new String[]{"mobile", "mouse", "moneypot", "monitor", "mousepad"}, "mouspepad");
    }

    //力扣代码
    //leetcode submit region begin(Prohibit modification and deletion)
    class Solution {
        public List<List<String>> suggestedProducts(String[] products, String searchWord) {
            Arrays.sort(products);
            int index = 0;
            String str = searchWord.substring(0, index + 1);
            List<List<String>> result = new ArrayList<>();
            for (int i = 0; i < products.length; i++) {
                if (products[i].startsWith(str)) {
                    List<String> list = new ArrayList<>();
                    for (int j = i; j < Math.min(i + 3, products.length); j++) {
                        if (products[j].startsWith(str)) {
                            list.add(products[j]);
                        }
                    }
                    index++;
                    result.add(new ArrayList<>(list));
                    if (index == searchWord.length()) {
                        break;
                    }
                    i--;
                    str = searchWord.substring(0, index + 1);
                }
            }
            if (index < searchWord.length()) {
                int size = result.size();
                for (int i = 0; i < searchWord.length() - size; i++) {
                    result.add(new ArrayList<>());
                }
            }
            return result;
        }
    }
//leetcode submit region end(Prohibit modification and deletion)

}