1. The team must use footnotes or endnotes or record the source of any external information in the scheme, and mark the cited information and materials in the reference list or bibliography. 2. The team chooses to solve a problem and submits the solution to the selected problem. 3. The names of any students, teachers and schools must not appear on any page of the solution. The solution cannot contain any identification information other than the team control number. 4. Papers must be submitted in the form of Adobe and PDF electronic files, typed in English, and the font is not less than 12. Papers must be within the page limit specified in the selected contest questions. There is no limit to the choice of topics, and all participating teams can choose any of the six questions. You must select a topic before printing the summary page and the control page. (2) The abstract page is "group, summary and table", which should be the first page of the electronic paper and submitted together with the final electronic paper. The deadline for submission is1before 0: 00 Beijing time on October 24th. (3) The control page is "Team, Control and Single", which is actually a personal information page (equivalent to the signature page of the National Games or other competitions), including the names and topics of the players. It needs to be printed, signed by team members (it can be signed on behalf of them), photographed or scanned, and sent to the mailbox designated by USA Match. Deadline for submission: before 6: 00 on February 3rd, Beijing time. (4) Paper submission: The final result is a pdf or doc file (not a compressed file format of zip or rar), and only the electronic version of the paper needs to be submitted, without proof materials. (If you want to attach the program or other content, you can add it to the appendix at the end of the article. Please send the paper to the designated mailbox in Messer by e-mail before Beijing time1October 24th 10: 00. (5) The submission mailbox is not limited. Don't ask the email address of the tutor or contact person. There are no restrictions such as QQ mailbox and Netease mailbox, and any mailbox can be sent. However, due to the time required for international mail delivery, it is suggested to send the paper before 9: 00 on1October 24th to ensure the successful submission of the paper. (6) If you have selected a topic and want to change the topic after downloading the summary page and control page, you can go back and re-select the topic, but you should also download the new summary page and control page again.