Maintenance notification

Dear users, We are going to suspend our service on the following schedule for maintenance. 【Schedule】 - Start time: Wed, June 5, 2019 14:00(UTC) - End time: Thu, June 5, 2019 20:00(UTC) 【Affected Resource】 - []( 【Background】 - Thanks to everyone, the number of participants in the contest has doubled in half a year. As a result, the response of the web page is delayed during the contest, causing everyone to feel unpleasant. - In order to solve this, we were doing continuous improvement without stopping the service, but maintenance with shutdown was finally required. We apologize for the inconvenience to our users. Thank you for your understanding.