How to calculate the short track speed skating directly advancing to the preliminaries?

Short track speed skating wins by ranking, and the competition system adopts elimination system. The first is the group preliminaries, and the top 2-3 players enter the next round, that is, the semi-finals; By analogy, the top 2-3 players in each group will enter the semi-finals, and the top 2-3 players will enter the finals. Usually only four people will participate in the finals of 500m and1000m, six people can participate in the finals of1500m and eight people can participate in the finals of 3000m. The athletes started at the same starting line. The station of the first round is decided by drawing lots, and then each round is allocated according to the result of the previous round, with the best result in the inner lane. During the competition, athletes can surpass their opponents at any time without violating the rules. If you collide with your body, trip or push or pull with your hands, you will be disqualified. Players who are disqualified for violating the rules cannot enter the next round. Do not leave the runway, slow down, collide or kick out.

According to the general situation, there are 4-6 athletes in the 500-meter and 1000-meter short-distance races, and the top 2-3 athletes can advance to the next round1; 1 there are 6-8 runners in the long-distance race over 500m, and the top 3-4 runners can advance to the next round1. In the preliminaries, the slide station will be determined by drawing lots, and in the subsequent competitions, the slide station will be determined according to the results of the last round of 1, and those with good results will stand on the inner slide!