Doi prieteni se afla pe axa Ox, in puncte cu coordonate întregi. Primul se află în punctul x1 = a, iar al doilea se află în punctul x2 = b. Fiecare se poate mișca cu o poziție, la stânga sau la dreapta, de un număr nelimitat de ori. Când se mișcă, oboseala se modifică după următoarea regulă: la prima mișcare oboseala crește cu 1, la a doua mișcare oboseala crește cu 2, la a treia cu 3 și asa mai departe. De exemplu, dacă un prieten se mișcă mai întâi la stânga, apoi la dreapta, și apoi iar la stânga, oboseala lui devine 1 + 2 + 3 = 6. Prietenii vor să se întâlnească într-un punct cu coordonata număr întreg. Aflați oboseala totală minimă pe care cei doi cei doi o vor acumula.

to change your username, you must:

1) make sure what the username you want to change to is allowed in this community

2) contact a administrator (for example, jaysl)

3) through pm, tell the admin what you want to change to

4) if the username is allowed, it will be changed in a matter of seconds (minutes at most)

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a  social news website  is an  internet  website  that features  user-posted stories. such stories are ranked based on popularity, as voted on by other users of the site or by website administrators. users typically comment online on the news posts and these comments may also be ranked in popularity. since their emergence with the birth of  web 2.0, social news sites have been used to link many types of information, including news, humor, support, and discussion. all such websites allow the users to submit content and each site differs in how the content is moderated. on the  slashdot  and  fark  websites,  administrators  decide which articles are selected for the front page. on  reddit  and  digg, the articles that get the most votes from the community of users will make it to the front page. many social news websites also feature an online comment system, where users discuss the issues raised in an article. some of these sites have also applied their voting system to the comments, so that the most popular comments are displayed first. some social news websites also have a  social networking  function, in that users can set up a user profile and follow other users' online activity on the website.