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2368 Messenger data structures hashing implementation string suffix structures strings Statement D Codeforces Round 344 (Div. 2) {631} PROGRAMMING Editorial Codeforces Round #344 (Div. 2) 2100
3349 Spy Syndrome 2 data structures dp hashing implementation sortings string suffix structures strings Statement C Manthan, Codefest 16 {633} PROGRAMMING Manthan, Codefest 16: Editorials 1900