The main idea of the title given n n n integers a 1 , a 2 , … , a n a_1,a_2,\dots,a_n a1?,a2?,…,an?, find ∑ i = 1 n ∑ j = i n ( ? k = i j a k ) 2 \sum\limits_{i=1}^n\sum\limits_{j=i}^n(\bigoplus\limits _{k=i}^ja_k)^2 i=1∑n?j=i∑n?(k=i?j?ak?)2 Output answer model 998244353 998244353 The value after […]
Tag: joi
MSQL Series (14) Mysql Practice – The difference between SQL statement left join inner join On and Where statement
Mysql practice-the difference between SQL statement On and Where statement Earlier we explained the selection principle of the underlying driver table of Join, and also learned about the two basic SQL query table connection methods: inner join and outer join. But what is the difference between on and where statements when we query multiple tables? […]
NOIP2023 Simulation 12 Joint Test 33 D. Ju Wei
NOIP2023 Simulation 12 Joint Test 33 D. 滈豕 Article directory NOIP2023 Simulation 12 Joint Test 33 D. Ju Wei The general idea of the topic Ideas code The main idea of the title Ideas Post a piece of material that explains the problem The ABO blood group system is a type of blood group system […]
NOIP2023 simulation 12 joint test 33 game
The main idea of the title have n n n physics laboratory, no. i i i laboratories have a i a_i ai? individuals, they are all playing games. classmate A A A can choose to enter a laboratory i i i, then let all a i a_i ai? individuals stopped playing games. Then the teacher […]
NOIP2023 simulation 12 joint test 33 structure
The main idea of the title Given a non-negative integer n n n, please construct a value not exceeding 40 × 40 40\times 40 40×40 matrix, fill in each position r r r. y y y. x x One of the three x, so that three consecutive grids form a string in order r y […]
NOIP2023 Simulation 12 Joint Test 33 Ju Tiao
The main idea of the title Given a n n n points m m m sides 0 / 1 0/1 0/1 weighted directed graph, you need to give each point A B C D ABCD A letter in ABCD makes every directed edge ( u , v , w ) (u,v,w) (u, v, w) all […]
NOIP2023 simulation 8 joint test 29 cake
The main idea of the title There is a two-dimensional cake that can be divided from left to right n n n columns, the height of each column is a i a_i ai?. For each column, it can be divided into a i a_i ai? block, and the top weight is 1 1 1. Add […]
NOIP2023 simulates 7 joint test 28 distance
The main idea of the title give one n n An unrooted tree with n nodes, each edge has an edge weight. w i w_i wi?. make d i s ( x , y ) dis(x,y) dis(x,y) is a point x x x to point y y y distance. You need to maintain an initially […]
NOIP2023 Simulation 6 Joint Test 27 Travel
The main idea of the title One has n n n points n n An undirected connected graph with n edges. Each edge has a color at the beginning. c c c. have m m m operations, each operation will change the two endpoints of a line into x , y x,y The color of […]
NOIP2023 Simulation 9 Joint Test 30 D. Gold Medal
NOIP2023 Simulation 9 Joint Test 30 D. Gold Medal Article directory NOIP2023 Simulation 9 Joint Test 30 D. Gold Medal The general idea of the topic Ideas code The main idea of the title There is one tree n n A tree of n nodes. Assume that the length of a path is d d […]