LeetCode
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Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings.
You need to help them find out their common interest with the least list index sum. If there is a choice tie between answers, output all of them with no order requirement. You could assume there always exists an answer.
Example 1:
Input:["Shogun", "Tapioca Express", "Burger King", "KFC"]["Piatti", "The Grill at Torrey Pines", "Hungry Hunter Steakhouse", "Shogun"]Output: ["Shogun"]Explanation: The only restaurant they both like is "Shogun".
Example 2:
Input:["Shogun", "Tapioca Express", "Burger King", "KFC"]["KFC", "Shogun", "Burger King"]Output: ["Shogun"]Explanation: The restaurant they both like and have the least index sum is "Shogun" with index sum 1 (0+1).
Note:
- The length of both lists will be in the range of [1, 1000].
- The length of strings in both lists will be in the range of [1, 30].
- The index is starting from 0 to the list length minus 1.
- No duplicates in both lists.
题意:给两个字符串数组,找出其中相同的字符串,返回在两个数组中索引相加最小的字符串,若有多个,则返回多个。
思路:用一个map把第一个数组全存起来,然后遍历第二个数组看有没有存在的字符串,记录最小索引和。再遍历一遍得出答案。时间复杂度O(n+m),空间复杂度O(n)
class Solution {public: vector<string> findRestaurant(vector<string>& list1, vector<string>& list2) { unordered_map<string, int> vis; vector<string> ans; for (int i = 0; i < list1.size(); ++i) { vis[list1[i]] = i; } int mmin = list1.size() + list2.size(); for (int i = 0; i < list2.size(); ++i) { if (vis.find(list2[i]) == vis.end()) continue; int x = i + vis[list2[i]]; mmin = min(mmin, x); } for (int i = 0; i < list2.size(); ++i) { if (vis.find(list2[i]) == vis.end()) continue; int x = i + vis[list2[i]]; if (x == mmin) ans.push_back(list2[i]); } return ans; }};
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