SCUT_Pein

Description They are N segments in x-axis, each segment has a start point X, a end point Y, so it can express as [X, Y]. Now you should select two segments, they have the longest overlap lengt

Description We define function F like this:    if(x==1)        F[x]=1;    else if(x%2==1)        F[x]=2*F[x/2]+1;    else        F[x]=2*F[x/2]-1. Of course it is easy for us to w