how is defined the quality of the solution?

the solution for this task looks pretty basic (like many other tasks), something like

System.out.println("日本語");

anyway, after validation it said: Your solution to the task was better than 7% other students. You solved it in 1 attempts. The average number of attempts for this task is 1.11. This task has been completed by 6698 students. so how were about 6000 people solving this better than this? there are many tasks were they said i made this better than 10%, 15%, 25% of the other students, so i should guess i am way bellow average? so i ask again: how is defined the quality of the solution?