https://codeforces.com/contest/2172/problem/H is a pretty fun exercise in the sense that you should look at all strings being compared and not just a pair.
https://codeforces.com/contest/2155/problem/F in the sense it's just 506D in a different coating.
https://codeforces.com/gym/105928/problem/E for being one of the most painful problems to implement.
https://codeforces.com/contest/2153/problem/F for being very similar to 1771F. (Also I solved it in the contest)
https://codeforces.com/contest/1771/problem/F for being very similar to 2153F. (Also it's a pretty fun hashing problem too)
https://codeforces.com/contest/997/problem/E for being the embodiment of "if the problem isn't hard enough, add queries to it"
https://codeforces.com/contest/2172/problem/H is a pretty fun exercise in the sense that you should look at all strings being compared and not just a pair.
https://codeforces.com/contest/2155/problem/F in the sense it's just 506D in a different coating.
https://codeforces.com/gym/105928/problem/E for being one of the most painful problems to implement.
https://codeforces.com/contest/2153/problem/F for being very similar to 1771F. (Also I solved it in the contest)
https://codeforces.com/contest/1771/problem/F for being very similar to 2153F. (Also it's a pretty fun hashing problem too)
https://codeforces.com/contest/997/problem/E for being the embodiment of "if the problem isn't hard enough, add queries to it"