leetcode 748. Shortest Completing Word

最新推荐文章于 2019-07-11 13:24:23 发布

转载最新推荐文章于 2019-07-11 13:24:23 发布 · 127 阅读

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原文链接：http://www.cnblogs.com/pk28/p/8051909.html

本文介绍了一种算法，用于从给定的字典单词中找到包含特定字符串（车牌号）所有字母的最短单词。算法考虑了大小写不敏感的情况，并确保了重复字符的需求得到满足。

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Find the minimum length word from a given dictionary words, which has all the letters from the string licensePlate. Such a word is said to complete the given string licensePlate

Here, for letters we ignore case. For example, "P" on the licensePlate still matches "p" on the word.

It is guaranteed an answer exists. If there are multiple answers, return the one that occurs first in the array.

The license plate might have the same letter occurring multiple times. For example, given a licensePlate of "PP", the word "pair" does not complete the licensePlate, but the word "supper" does.

Example 1:
Input: licensePlate = "1s3 PSt", words = ["step", "steps", "stripe", "stepple"]
Output: "steps"
Explanation: The smallest length word that contains the letters "S", "P", "S", and "T".
Note that the answer is not "step", because the letter "s" must occur in the word twice.
Also note that we ignored case for the purposes of comparing whether a letter exists in the word.
Example 2:
Input: licensePlate = "1s3 456", words = ["looks", "pest", "stew", "show"]
Output: "pest"
Explanation: There are 3 smallest length words that contains the letters "s".
We return the one that occurred first.
Note:
licensePlate will be a string with length in range [1, 7].
licensePlate will contain digits, spaces, or letters (uppercase or lowercase).
words will have a length in the range [10, 1000].
Every words[i] will consist of lowercase letters, and have length in range [1, 15].

模拟找一下

class Solution {
public:
    string shortestCompletingWord(string licensePlate, vector<string>& words) {
        map<char, int> mp;
        int len = 1000000;
        string ans = "";
        for (auto c : licensePlate) {
            if (c >= 'A' && c <= 'Z') c += 32;
            if (c >= 'a' &&c <= 'z') {
                mp[c]++;
                cout << c <<endl;
            }
        }
        for (int i = 0; i < words.size(); ++i) {
            map<char, int> mp1 = mp;
            for (auto c : words[i]) {
                if (c >= 'A' && c <= 'Z') c += 32;
                if (c >= 'a' &&c <= 'z') {
                    if (mp1[c] > 0)mp1[c] --;
                }
            }
            int mark = 0;
            for (auto x : mp1) {
                if (x.second != 0) {
                    mark = 1;break;
                }
            }
            if (!mark) {
                if (words[i].size() < len) {
                    len = words[i].size();
                    ans = words[i];
                }
            }
        }
        return ans;
    }
};

转载于:https://www.cnblogs.com/pk28/p/8051909.html