viewimage.php?no=24b0d769e1d32ca73cee86fa11d0283191de25edc716dfae8790c63e5c68dc5acfd477586098057338c3766c2f937450c228ce3f5dab002bc044347f279d342c5f5db0c9a2dc382deaf86eb5bc16ec3af30bc9a5d037000ec362cda4b5991f

https://codeforces.com/contest/1089/problem/J?mobile=false

윽엑