Hello Codeforces, In the last contest Rayan Programming Contest 2024, I performed quite poor, I solved A and B but I was stuck at C for hours, every time a 2 dimensional grid-type problem appears that has recursion and backtracking stuff I always get stuck at them. There's also a catch that in the problem I should use Depth-First Search, but I suck at recursion and backtracking so I couldn't make sense of it properly. I've read many of -is-this-fft- blogs (they are amazing literally) and they helped me very much, but this topic always makes me uncomfortable. Thank You, maieshadnan