2023NOIP A layer joint test 30 A. Strawberry Train Article directory 2023NOIP A layer joint test 30 A. Strawberry Train The general idea of the topic Ideas code The main idea of the title Given a sequence a a a, there is m m m operations, the [ l , r ] [l , r] […]
Tag: join
9.spark adaptive query-AQE’s dynamic adjustment of Join strategy
Directory Overview Dynamically adjust Join strategy principle Actual combat Dynamically Optimize Skewed Join principle Actual combat Overview broadcast hash join is similar to broadcast variable in Spark shared variables. If Spark join can adopt this strategy, the join performance will be the best. Adaptive Query Execution (Adaptive Query Execution) Dynamically adjust Join strategy principle Actual […]
Understanding of thread join() method
Understanding of the join() method of java thread thread.join() adds the specified thread to the current thread, and can combine two alternately executed threads into a sequentially executed thread. To put it simply, it is synchronization. Example 1: For example, if the join method of thread A is called in thread B, thread B will […]
JOIN algorithm principle and optimization
Article directory Preface 1. JOIN operation method 2. Driver table and driven table 1. What is a driver table? 3. Principle of JOIN algorithm 4. Summary of JOIN algorithm Summarize Foreword JOIN: used in mysql to perform join table operations, to match data from two tables, and to filter and merge the result set that […]
NOIP2023 simulation 16 joint test 37 big-eyed raccoon cat
The main idea of the title There are two lengths n n sequence of n a , b a,b a, b, these two sequences are monotonic. you can a a a proceeds no more than m m m operations, you can choose one for each operation i i i satisfy 1 ≤ i ≤ n […]
NOIP2023 simulation 16 joint test 37 D. Kitten eats dragon fruit
NOIP2023 simulation 16 joint test 37 D. Kitten eats dragon fruit Article directory NOIP2023 simulation 16 joint test 37 D. Kitten eats dragon fruit The general idea of the topic Ideas code The main idea of the title have n n n items A A A, B B B, C C C, A A A […]
Euler angles (roll angle, pitch angle, yaw angle), rotation matrix, quaternion conversion and solution to universal joint deadlock
1. Overview The description method of the pose (position and direction) of an object is generally represented by two coordinate systems. One is the world coordinate system or the ground coordinate system. Here I call it the ground coordinate system, which belongs to the reference coordinate system; the other is its own Coordinate system, it […]
NOIP2023 simulation 13 joint tests 34 competition
The main idea of the title Given a n n A team of n players goes to participate in the competition. The competition has m m m questions, each player can 100 % 100\% 100% will be l i ~ r i l_i \sim r_i li?~ri? Questions are completed. During the competition, the team will […]
NOIP2023 simulation 13 joint test 34 abstract
The main idea of the title There is one tree with n n A tree of n points, each point has a point weight a i a_i ai?, f ( i , j ) f(i,j) f(i,j) and g ( i , j ) g(i,j) g(i,j) respectively represent i i i arrive j j Find the […]
CMAKE: Facilitates joint programming between CUDA and other languages (C, C++, RUST)
In CUDA programming, especially when it involves multi-language mixed programming, such as C/C++ and CUDA or RUST and CUDA, etc., it is still troublesome to use the NVCC compiler to compile some large projects. Using cmake to configure compilation options is relatively simple and powerful. cmake is a powerful automated configuration tool that is open […]