以下就是我对多条件排序的一点理解
元组里面的字段分别是(名字,分数,身高,体重)
students ((a,100,180,180),(b,90,150,130),(c,100,150,120),(d,90,180,120),(e,100,180,150),(f,90,180,150)) a sorted(students,…
题目链接 Leetcode.1465 切割后面积最大的蛋糕 rating : 1445 题目描述
矩形蛋糕的高度为 h h h 且宽度为 w w w,给你两个整数数组 h o r i z o n t a l C u t s horizontalCuts horizontalCuts 和 v e r t i c a l C u t s verticalCuts verticalCuts…
题目链接 Leetcode.330 按要求补齐数组 hard 题目描述
给定一个已排序的正整数数组 n u m s nums nums ,和一个正整数 n n n 。从 [ 1 , n ] [1, n] [1,n] 区间内选取任意个数字补充到 n u m s nums nums 中,使得 [ 1 , n ] [1, n] [1,n] 区间内的…
题目 Formation is very important when taking a group photo. Given the rules of forming K rows with N people as the following: The number of people in each row must be N/K (round down to the nearest integer), with all the extra people (if any) standing in t…
题解-P9658 Laser Trap
题目传送门
题意简述
题面是英文的,还没翻译,就讲一讲吧。 n n n 个激光发射器,两两之间产生激光束,将平面分为若干区域。 问至少删去多少个发射器,可以使得原点与外侧区域联通。 多组数据&a…
题目来源:PAT (Advanced Level) Practice
Given an increasing sequence S of N integers, the median is the number at the middle position. For example, the median of S1 { 11, 12, 13, 14 } is 12, and the median of S2 { 9, 10, 15, 16, 17 } is 15. Th…
原题目:https://leetcode-cn.com/problems/all-elements-in-two-binary-search-trees/ 思路:
中序遍历两棵树,然后合并两个排好序的数组 代码:
/*** Definition for a binary tree node.* struct TreeNode {* int val;* …
1062 Talent and Virtue (25 分)
About 900 years ago, a Chinese philosopher Sima Guang wrote a history book in which he talked about people’s talent and virtue. According to his theory, a man being outstanding in both talent and virtue must be a “sage&…
我们使用order by对字段进行排序的时候,我们发现排完后并不是按照我们要求的进行升序或者降序,出现排序错误: 例如:select * from app_mobile_device lo order by lo.romtype desc; 我用order by 倒序排序romtype&…
快速排序排序相对于普通排序算法效率很高,特别是对于大数据优势体现的相当明显下面是java程序主程序:
public class Sort {/*** param args the command line arguments*/public static void main(String[] args) {int size10000000;//千万数据long[] SJ…
Every day a Leetcode
题目来源:3016. 输入单词需要的最少按键次数 II
解法1:哈希 排序
本题与 3014. 输入单词需要的最少按键次数 I 唯一不同的点在于:
3014. 输入单词需要的最少按键次数 I 中字符串 word 所有字母互不相同࿰…
题目来源:PAT (Advanced Level) Practice
The magic shop in Mars is offering some magic coupons. Each coupon has an integer N printed on it, meaning that when you use this coupon with a product, you may get N times the value of that product back! …
一、总结
原文:https://zhuanlan.zhihu.com/p/26539920 二、后续其他比较好的资料
Learning to Rank简介:https://www.cnblogs.com/bentuwuying/p/6681943.html Learning to Rank算法介绍:RankNet,LambdaRank,Lambda…
文章目录 一、题目二、题解 一、题目
274. H-Index
Given an array of integers citations where citations[i] is the number of citations a researcher received for their ith paper, return the researcher’s h-index.
According to the definition of h-index on Wik…
题目来源:PAT (Advanced Level) Practice
Excel can sort records according to any column. Now you are supposed to imitate this function.
Input Specification:
Each input file contains one test case. For each case, the first line contains two inte…
题目来源:PAT (Advanced Level) Practice
The ranklist of PAT is generated from the status list, which shows the scores of the submissions. This time you are supposed to generate the ranklist for PAT.
Input Specification:
Each input file contain…
1028 List Sorting (25 分)
Excel can sort records according to any column. Now you are supposed to imitate this function.
Input Specification
Each input file contains one test case. For each case, the first line contains two integers N (≤10 ^5 ) and C, …
【LetMeFly】274.H 指数:排序
力扣题目链接:https://leetcode.cn/problems/h-index/
给你一个整数数组 citations ,其中 citations[i] 表示研究者的第 i 篇论文被引用的次数。计算并返回该研究者的 h 指数。
根据维基百科上 h 指数的定义&…
算法思想:
快速排序
class Solution {
public:void quickSort(vector<int> & a, int left, int right){if(left > right) return;int i left, j right;int base a[left];while(i < j){while(a[j] > base && i < j){j--;}while(a…
题目来源:PAT (Advanced Level) Practice
Forbes magazine publishes every year its list of billionaires based on the annual ranking of the worlds wealthiest people. Now you are supposed to simulate this job, but concentrate only on the people in a…
Every day a Leetcode
题目来源:452. 用最少数量的箭引爆气球
解法1:排序 贪心
题解:用最少数量的箭引爆气球
我们首先随机地射出一支箭,再看一看是否能够调整这支箭地射出位置,使得我们可以引爆更多数目的气球。…
在Java刷题过程中,无论是数组、ArrayList还是HashMap,排序是必不可少的,下面就对这些不同数据结构的排序做一个汇总。
1. 数组排序
1)一维数组
直接调用sort方法:
int[] num new int[n];
Arrays.sort(num);自定义…
JSON对象字符串数组,多字段(多列)排序
今天看到我写的另一篇JSON对象数组排序的文章,突然想到了另一种,更简便,更快速的方法,排序结果跟原来的一样:
function newSort(objArr, key…
std::vector的其它操作
1.定义一个Index类作为vector的参数: class Index {public:Index(){};Index(int a, float b) {i a;cost b;}Index(int a, float b,int c) {i a;cost b;parent_ic;}Index(int a, float b,int c,int d,int e) {i a;cost b;parent_ic;cur…
Every day a Leetcode
题目来源:3035. 回文字符串的最大数量
解法1:哈希 排序
由于可以随意交换字母,先把所有字母都取出来,然后考虑如何填入各个字符串。
如果一个奇数长度字符串最终是回文串,那么它正中间的那…
Every day a Leetcode
题目来源:2583. 二叉树中的第 K 大层和
解法1:层序遍历 排序
先使用层序遍历计算出树的每一层的节点值的和,保存在数组 levelSum 中。然后将数组进行排序,返回第 k 大的值。需要考虑数组长度小于 k 的边…
A 判断通过操作能否让字符串相等 I s 1 s1 s1和 s 2 s2 s2第 1 1 1、 2 2 2位若同位置不等,则 s 1 s1 s1交换对应的 i i i和 j j j位置,之后判断 s 1 s1 s1和 s 2 s2 s2是否相当 class Solution {
public:bool canBeEqual(string s1, string s2) {for (i…
题目来源:PAT (Advanced Level) Practice
This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female students.
Input Specification:
Each input file contains one test c…
排序
SELECT employee_id, first_name, last_name, hire_date, salary
FROM employees
ORDER BY first_name; --按字母,默认升序
ORDER BY hire_date ASC; --升序
ORDER BY hire_date DESC; --降序SELECT employee_id, first_name, last_name, hire_date, salary
F…
golang sort package: https://golang.org/src/sort
sort 操作的对象通常是一个 slice,需要满足三个基本的接口,并且能够使用整数来索引
// A type, typically a collection, that satisfies sort.Interface can be
// sorted by the routines in thi…
失效语句:
获取的change_date不是最大值
select product_id, new_price, change_date
from (select product_id ,new_price, change_datefrom Products order by change_date desc
) as a
group by product_id 生效语句:
增加distinct使order by生效…
分数 25
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作者 CHEN, Yue
单位 浙江大学
Zhejiang University has 40,000 students and provides 2,500 courses. Now given the registered course list of each student, you are supposed to output the student name lists of all the courses. …
1、冒泡排序-- 两层循环的run,有一个优化指出就是当后面的数打于前面一个是可以结束一个循环这样可以节省时间;
2、插入排序,最好情况为O(NlogN): void insertSort(int *a,const int &length) { int nlength; int j; for(int…
奇怪的慢sql我们先来看2条sql第一条:select * from acct_trans_log WHERE acct_id 1000000000009000757 order by create_time desc limit 0,10第二条:select * from acct_trans_log WHERE acct_id 1000000000009003061 order by create_time desc l…
【LetMeFly】2596.检查骑士巡视方案
力扣题目链接:https://leetcode.cn/problems/check-knight-tour-configuration/
骑士在一张 n x n 的棋盘上巡视。在有效的巡视方案中,骑士会从棋盘的 左上角 出发,并且访问棋盘上的每个格子 恰好一次 。…
异常信息 Format: Comparison method violates its general contract! Params: null StackTrace: java.lang.IllegalArgumentException: Comparison method violates its general contract! at java.util.TimSort.mergeHi(TimSort.java:899) at java.util.TimSort.mergeAt(TimS…
题目来源:PAT (Advanced Level) Practice
Shuffling is a procedure used to randomize a deck of playing cards. Because standard shuffling techniques are seen as weak, and in order to avoid "inside jobs" where employees collaborate with ga…
题目来源:PAT (Advanced Level) Practice
Eva loves to collect coins from all over the universe, including some other planets like Mars. One day she visited a universal shopping mall which could accept all kinds of coins as payments. However, ther…
2022计算机考研408—数据结构—排序 手把手教学考研大纲范围内的排序 22考研大纲数据结构要求的是C/C,笔者以前使用的都是Java,对于C还很欠缺, 如有什么建议或者不足欢迎大佬评论区或者私信指出 Talk is cheap. Show me the code. 理论到处都…
★ 数组转Collection 使用Apache Jakarta Commons Collections: import org.apache.commons.collections.CollectionUtils; String[] strArray {"aaa", "bbb", "ccc"};
List strList new ArrayList();
Set strSet new Has…
题目链接:
https://cn.vjudge.net/contest/274196#problem/A “Waiting for orders we held in the wood, word from the front never came By evening the sound of the gunfire was miles away Ah softly we moved through the shadows, slip away through the …
题目描述 在O(n log n)的时间内使用常数级空间复杂度对链表进行排序。 Sort a linked list in O(n log n) time using constant space complexity. 思路
既然是在常数的空间复杂度,即o(1)的空间复杂度内,那么递归是不能考虑了,这种情况下,只…
1055 The World’s Richest (25 分)
Forbes magazine publishes every year its list of billionaires based on the annual ranking of the world’s wealthiest people. Now you are supposed to simulate this job, but concentrate only on the people in a certain range…
nth_element() 算法和 partial_sort() 不同。应用的范围由它的第一个和第三个参数指定。第二个参数是一个指向第 n 个元素的迭代器。如果这个范围内的元素是完全有序的,nth_dement() 的执行会导致第 n 个元素被放置在适当的位置。这个范围内,在第 n 个元…
题目 Zhejiang University has 8 campuses and a lot of gates. From each gate we can collect the in/out times and the plate numbers of the cars crossing the gate. Now with all the information available, you are supposed to tell, at any specific time point, th…
Description 下面是一段实现冒泡排序算法的C代码: for (int i1;i<n;i) for (int j1;j<n-i;j) if (a[j]>a[j1]) swap(a[j],a[j1]); 其中待排序的a数组是一个1~n的排列,swap函数将交换数组中对应位置的值。 对于给定的数组a以及给…
原文地址为:
对List里的对象元素进行排序看了一下,好像有两种方法,第一个是实例化一个比较器,例子如下 public class Student { private int studentId; private String studentName; private int age; public St…
题面 题意 给定一个序列,找一个最长的子序列,满足对于子序列的任意两个数ai,aj,(1<i<j<k),使得 | ai - aj | > MAX (子序列中最大的数) 题解 对于子序列,如果都是负数或者0一定成立,…
2023每日刷题(二十五)
Leetcode—2300.咒语和药水的成功对数 排序二分实现代码
class Solution {
public:int lower_bound(vector<int> &potions, long long target) {int n potions.size();int left 0, right n;int mid left (right -…
import java.util.*;
public class test2 {
public static void main(String[] args) {
Scanner scan new Scanner(System.in);
String[] str scan.nextLine().split(" ");// 输入时以空格隔开数字
int[] num new int[str.length];//初始化一个整型数组&…
文章目录 初步示例创建动态数组增删改迭代 初步示例
Rust提供了动态数组这种数据类型,所谓动态,就是长度可变,示例如下
fn main(){let mut vec Vec::new();for i in 1..5{vec.push(i);}for i in &vec{println!("{}", i);}
}…
A 计算 K 置位下标对应元素的和 模拟 class Solution {
public:int pop_cnt(int x) {//求x的二进制表示中的1的位数int res 0;for (; x; x >> 1)if (x & 1)res;return res;}int sumIndicesWithKSetBits(vector<int> &nums, int k) {int res 0;for (int i…
A 分类求和并作差 模拟 class Solution {
public:int differenceOfSums(int n, int m) {int res 0;for (int i 1; i < n; i)res i % m ! 0 ? i : -i;return res;}
};B 最小处理时间 排序:设四个 p r o c e s s o r T i m e processorTime processorTime 的元…
题目链接 Leetcode.2731 移动机器人 rating : 1923 题目描述
有一些机器人分布在一条无限长的数轴上,他们初始坐标用一个下标从 0 0 0 开始的整数数组 n u m s nums nums 表示。当你给机器人下达命令时,它们以每秒钟一单位的速度开始移动。
给你一个…