[ 2-SAT 线段树 ] Codeforces Gym 100159 Facebook Hacker Cup 2012 I.Unfriending
%%%Manchery题解#includeusingnamespacestd;#definelllonglonginlinecharnc(){staticcharbuf[100000],*p1=buf,*p2=buf;returnp1==p2&&(p2=(p1=buf)+fread(buf,1,100000,stdin),p1==p2)?EOF:*p1++;}inlinevoidRead(int&