摘要:
Discription You are given an array a consisting of n integers, and additionally an integer m. You have to choose some sequence of indices b1, b2, ..., 阅读全文
摘要:
Discription This time I need you to calculate the f(n) . (3<=n<=1000000) f(n)= Gcd(3)+Gcd(4)+…+Gcd(i)+…+Gcd(n). Gcd(n)=gcd(C[n][1],C[n][2],……,C[n][n-1 阅读全文