Location planning of automatic or three-dimensional warehouse (Hungarian algorithm), course design of stacker path optimization

In p>189, several British naval officers stationed in India happened to find it quite exciting to play tennis on a small table. Later, they used a small hollow ball instead of a solid ball with little elasticity, and used a wooden board instead of a racquet to play this novel "tennis match" on the table, which is the origin of the name table tennis. Soon after the appearance of Table tennis, it became a popular sport. At the beginning of the 2th century, the United States began to produce complete sets of table tennis equipment. Initially, table tennis had other names, such as Indoor tennis. Later, an American manufacturer coined the new word ping-pong with the sound made by ping-pong when it hit, and used it as the registered trademark of his "ping-pong" patent. Ping-pong later became another official name of table tennis. When it spread to China, people coined the new word "table tennis". In Japanese, table tennis is called table tennis. Many words in table tennis are derived from tennis. The ball used in table tennis is called ping-pong ball or table-tennis ball, the table tennis table is called ping-pong table, the table top is called court, the net in the middle is called NET, and the shelf supporting the net is called net support. Table tennis singles usually used the best of three games or best of five games (21 points per game), but in 21 it was changed to the best of seven games or best of five games (11 points per game). The so-called "game" is set in English. Serve is called serve. Table tennis originated in Britain, and Europeans call it "tennis on the table" so far. It can be seen that table tennis is developed from tennis. At the end of the 19th century, tennis was popular in Europe. However, due to the limitation of venue and weather, some college students in Britain moved tennis indoors, using the dining table as a table, books as a net, parchment as a racket and beating it around the dining table. At the beginning of the 2th century, table tennis flourished in Europe and Asia. In 1926, an international table tennis invitational tournament was held in Berlin, Germany, which was later regarded as the first world table tennis championship, and the International Table Tennis Federation was established. The extensive development of table tennis has greatly improved rackets and balls. The original racket was a slightly processed board, and later someone put a layer of sheepskin on it. With the development of modern industry, Europeans put rubber with rubber particles on rackets. In the early 195s, the Japanese invented a racket with thick sponge. The original ball was a kind of rubber ball similar to tennis. In 189, British athlete Gibb brought back some celluloid balls as toys from the United States for table tennis. In various table tennis competitions. The most prestigious is the World Table Tennis Championships, which was held once a year at first, and changed to be held once every two years after 1957. In 194, Wang Daowu, the owner of a stationery store in Shanghai, bought 1 sets of table tennis equipment from Japan. Since then, table tennis has been introduced to China. Agree with 1| comment