CodeForces cf Educational Codeforces Round 85 (Rated for Div. 2)B. Middle ClassCodeForces String Modification (CodeCraft-20 (Div. 2))CodeForcesアルゴリズム#アルゴリズム#
cf Educational Codeforces Round 85 (Rated for Div. 2)B. Middle ClassCodeForces String Modification (CodeCraft-20 (Div. 2))CodeForcesアルゴリズム#アルゴリズム#