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1. 两数之和
题目描述 leetcode - 1:https://leetcode-cn.com/problems/two-sum/ 解题关键 hashmap的使用 碎碎念 题目比较简单,暴力过很容易,不过借助hash可以降低时间复杂度,但是增加了空间的消耗。学习了hashmap的使用 key:value 定义 ...
分类:其他好文   时间:2020-06-01 01:06:46    阅读次数:77
LeetCode 29. 两数相除 Divide Two Integers
使用了long。没有解决int的溢出问题。 class Solution { public: int divide(int dividend, int divisor) { //if (dividend == 0) return 0; //if (divisor == 1) return divid ...
分类:其他好文   时间:2020-05-31 18:17:56    阅读次数:101
【POJ3133】Manhattan Wiring (插头dp)
Manhattan Wiring 题意: There is a rectangular area containing n × m cells. Two cells are marked with “2”, and another two with “3”. Some cells are occup ...
分类:其他好文   时间:2020-05-31 16:26:04    阅读次数:66
[LeetCode] 77. Combinations
Given two integers n and k, return all possible combinations of k numbers out of 1 ... n. Example: Input: n = 4, k = 2 Output: [ [2,4], [3,4], [2,3], ...
分类:其他好文   时间:2020-05-31 13:17:49    阅读次数:57
【LeetCode 力扣】1. Two Sum 两数之和 Java 解法
LeetCode的第一题,英文单词书中 Abandon 一般的存在,让我们来看一下题目: Given an array of integers, return indices of the two numbers such that they add up to a specific target. ...
分类:编程语言   时间:2020-05-31 11:10:15    阅读次数:107
LeetCode 371. 两整数之和 Sum of Two Integers
不断更新值和进位。 class Solution { public: int getSum(int a, int b) { return b == 0 ? a : getSum(a ^ b, ((unsigned int)a & b) << 1); } }; ...
分类:其他好文   时间:2020-05-30 01:24:53    阅读次数:70
LeetCode 350. 两个数组的交集 II Intersection of Two Arrays II
进阶解法1:排序双指针 class Solution { public: vector<int> intersect(vector<int>& nums1, vector<int>& nums2) { sort(nums1.begin(), nums1.end()); sort(nums2.begi ...
分类:编程语言   时间:2020-05-30 01:20:17    阅读次数:70
2. 两数相加(链表的使用)
题目描述 leetcode - 2:https://leetcode-cn.com/problems/add-two-numbers/ 解题关键 C++ 链表 数据结构的定义和遍历 代码 /** * Definition for singly-linked list. * struct ListNo ...
分类:其他好文   时间:2020-05-29 09:15:52    阅读次数:73
Exercise 3: Integer Right Triangles
Given a perimeter of 60, we can find two right triangles with integral length sides: [(10, 24, 26), (15, 20, 25)]. Complete the following function, wh ...
分类:其他好文   时间:2020-05-28 00:59:06    阅读次数:86
496. Next Greater Element I
package LeetCode_496 /** * 496. Next Greater Element I * https://leetcode.com/problems/next-greater-element-i/description/ * * You are given two array ...
分类:其他好文   时间:2020-05-26 22:09:23    阅读次数:112
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