Hello! I have been solving Div2 D problem from the latest contest ( It's just simply BFS ) and faced with one strange fact. When I use two arrays in my solution I got AC with 1700 ms or more — 31662651 and it's near the TL = 2000 ms. So, I decided to improve it and figured out that when I use only one array instead of two I got AC with 1388 ms — 31662579. So, you can see that it's almost there is no difference between them in memory, then where is my 300 ms? Thanks.