What are the criteria for the NBA to select players in various universities? Please, great gods.

Many procedures and rules of NBA draft are still like "seeing flowers in the fog" for some China fans. According to the time division, the annual NBA draft can be roughly divided into two parts. The first part is the draft lottery: the NBA began to implement the draft lottery from 1985. Every year when the playoffs are in full swing, the NBA will convene teams that fail to enter the playoffs to hold a lottery ceremony to determine the ownership of the top three draft picks in the future. In the lucky draw ceremony, the host will take out 1- 14 ping-pong balls and put them into the container. Four balls are randomly selected from 14 balls, regardless of numerical order. A * * can produce 100 1 possible combinations. Before the draw, the teams that didn't qualify for the playoffs had been ranked in reverse order according to the regular season record, and the corresponding combination number (probability) of winning the first prize was obtained. For example, 14 teams failed to make the playoffs this year. In this 14 team, the eagle with the worst record got 250 combinations, that is, there was a 25% chance to win the first place, and the wasp with the second worst record got 199, that is, 19.9% chance, and so on,/kloc-0.9%. After the draw for No.1 draft, four table tennis balls were put back into the container, and the ownership of No.2 and No.3 draft picks was decided again. After that, the remaining No.4-30 draft picks in the first and second rounds were decided in reverse order according to the results of the regular season. In addition to the regular draft procedures, the NBA has added some special rules for American high school graduates and overseas players to participate in the draft. The following are the provisions of the NBA labor agreement for these two types of players to participate in the NBA draft. Provisions for American high school graduates to apply for participation in the draft (1) Players who have settled in the United States and completed their high school education can send a written notice to the NBA 45 days before the start of the draft, and are eligible to participate in the NBA draft after expressing their willingness to give up entering the university to continue their studies. Once a player is selected by any NBA team, the following rules will apply: (i) According to the following (b), if a player does not join the college basketball team, he will be eligible to participate in the NBA draft. During the period from the day when he gave up the college entrance examination opportunity to the day when he was qualified to participate in the draft, if an NBA team invited the player as required every year, then the team would be the only team that could sign a player contract with him. In this part, once a player fails to give up the qualification to join the college basketball team after obtaining the qualification of the NBA draft, the draft will be regarded as his "second choice". Players who are selected as "second choice" will abide by the applicable rules. If a player is selected because he gave up his college basketball qualification in the draft, he has not signed a player contract with the team that selected him, and has not been selected in the "second choice" (as explained in the previous statement), we call it a newcomer free agent. (ii) If a player joins the college basketball team, he can still be eligible to participate in the NBA draft once he gives up the opportunity to continue playing for the college basketball team. At that time, the NBA team that selected him in the draft and sent him an invitation every year as required will reserve the priority to negotiate and sign a player contract with him one year after the draft date. In this part, once a player fails to give up his qualification to join the college basketball team after winning the NBA draft, the draft will be regarded as his "primary election" and the next draft will be regarded as "second choice". Players who are selected as "second choice" will abide by the applicable rules. (b) Players who have settled in the United States and completed high school will be eligible to participate in the next NBA draft if they are not eligible to participate in the NBA draft and sign contracts with professional basketball teams outside the United States. If selected, he will be regarded as a "player" as defined in Section 4 above. In this section, "professional basketball team" refers to a basketball team that pays any kind of money or remuneration that exceeds the general living expenses to the basketball players who play for it in any country. Rules for overseas players to participate in the NBA draft (1) In this section, "overseas player" refers to any amateur or professional basketball player who is designated to live outside the United States. (b) Overseas players are eligible to participate in the NBA draft after reaching the age of 22. Any player who is over 22 years old and has not been selected in the draft on his 22nd birthday is called a rookie free agent. (c) Despite the provisions in subsection (b) above, an overseas player who has never participated in an American college basketball team can still be eligible to participate in the draft before his 22nd birthday: (i) he must be at least 18 years old before the draft; (ii) He must give a written notice to the NBA 45 days before the draft starts, expressing his wish to be qualified to participate in the draft. (d) If an overseas player plays for the American college basketball team in the season before the draft, he must abide by the provisions in Section 5 above on continuing to complete or give up college studies. Traditionally, the rules of the draw ceremony in NBA draft are: put 1 to 14/4 table tennis balls into a drum, and choose four balls from them to form a combined result. A * * will have 100 1 combination results. If one result is ignored, the remaining 1000 results will be randomly assigned to 13 teams by the computer. The worse the team's record in the regular season, the more results will be distributed. The team at the bottom of the league will get 225 results. Then shake out four balls like a lottery, and a group of four numbers is born. Which team's performance includes this, it will have the first prize. Then put the four balls back in the bucket, repeat the above process twice, and take the second and third draft (note: if the ignored result is shaken out, it will be invalid, put the balls back and repeat the above procedure). Teams that don't get the top three picks will get the fourth to thirteenth rookies according to their regular season records. The worse their record, the higher their ranking in the draft. According to the regulations, the whole lottery process will be attended by NBA officials, 13 team representatives and accountants who supervise the lottery. After the "lucky draw", the accountant will put the cards with the team logo in three envelopes marked 1 to 3, and then seal them. Neither granick, vice president of NBA, nor the team representative can know in advance what the result is in the envelope. Subsequently, the NBA will officially announce the lottery results. First, the draft picks from 4th to 13 were announced, and then granick opened the envelope and announced the top three teams in turn. This means that the team marked in the last opened envelope will win the "No.1 pick" in the draft one month later.