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132 Knightmare (easy) graphs interactive shortest paths Statement E1 Codeforces Round 577 (Div. 2) {1201} PROGRAMMING Codeforces Round #577 (Div 2) Editorial 2900
148 Knightmare (hard) graphs interactive shortest paths Statement E2 Codeforces Round 577 (Div. 2) {1201} PROGRAMMING Codeforces Round #577 (Div 2) Editorial 3000