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393 Twilight and Ancient Scroll (easier version) dp hashing implementation string suffix structures strings Statement E1 Codeforces Round 662 (Div. 2) {1393} PROGRAMMING 1500.0 Codeforces Round #662 Editorial
382 Twilight and Ancient Scroll (harder version) dp implementation string suffix structures strings Statement E2 Codeforces Round 662 (Div. 2) {1393} PROGRAMMING 1500.0 Codeforces Round #662 Editorial