随笔分类 - 哈希表

LeetCode 454 四数相加 II

摘要：class Solution { public: int fourSumCount(vector<int>& nums1, vector<int>& nums2, vector<int>& nums3, vector<int>& nums4) { unordered_map<int, int> ma 阅读全文

posted @ 2022-09-06 09:35 hjy94wo 阅读(7) 评论(0) 推荐(0) 编辑

LeetCode 383 赎金信

摘要：class Solution { public: bool canConstruct(string ransomNote, string magazine) { int record[26] ={0}; //默认值为0 if (magazine.size() < ransomNote.size()) 阅读全文

posted @ 2022-09-05 18:18 hjy94wo 阅读(7) 评论(0) 推荐(0) 编辑

LeetCode 1 两数之和

摘要：class Solution { public: vector<int> twoSum(vector<int>& nums, int target) { unordered_map<int, int> map; for (int i = 0; i < nums.size(); i ++) { aut 阅读全文

posted @ 2022-09-05 17:36 hjy94wo 阅读(12) 评论(0) 推荐(0) 编辑

LeetCode 202 快乐数

摘要：class Solution { public: int getSum(int n) { int sum = 0; while (n) { sum += (n % 10) * (n % 10); n /= 10; } return sum; } bool isHappy(int n) { unord 阅读全文

posted @ 2022-09-05 17:15 hjy94wo 阅读(10) 评论(0) 推荐(0) 编辑

LeetCode 349 两个数组的交集

摘要：class Solution { public: bool record[1010]; vector<int> res; vector<int> intersection(vector<int>& nums1, vector<int>& nums2) { unordered_set<int> set 阅读全文

posted @ 2022-09-05 16:13 hjy94wo 阅读(14) 评论(0) 推荐(0) 编辑