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Codeforces 583C GCD Tabl 题目 The GCD table G of size n × n for an array of positive integers a of length n is defined by formula Let us remind you that the greatest common divisor (GCD) of two positi...

CodeForces - 1234B2 Social Network (hard version) 题目： The only difference between easy and hard versions are constraints on n and k . You are messaging in one of the popular social networks via you...

HDU 3038 How Many Answers Are Wrong（带权并查集） 题目： TT and FF are … friends. Uh… very very good friends -________-b FF is a bad boy, he is always wooing TT to play the following game with him. This is a ve...