SRM 464 DIV1 500 2-sat 思路和hdu3622基本差不多

SRM 464 DIV1 500

#include<iostream>
#include<cstring>
#include<algorithm>
#include<cstdio>
#include<vector>
#include<sstream>
#include<string>
#include<climits>
#include<stack>
#include<set>
#include<bitset>
#include<cmath>
#include<deque>
#include<map>
#include<queue>
#define iinf 2000000000
#define linf 1000000000000000000LL
#define dinf 1e200
#define eps 1e-11
#define all(v) (v).begin(),(v).end()
#define sz(x)  x.size()
#define pb push_back
#define mp make_pair
#define lng long long
#define sqr(a) ((a)*(a))
#define pii pair<int,int>
#define pll pair<lng,lng>
#define pss pair<string,string>
#define pdd pair<double,double>
#define X first
#define Y second
#define pi 3.14159265359
#define ff(i,xi,n) for(int i=xi;i<=(int)(n);++i)
#define ffd(i,xi,n) for(int i=xi;i>=(int)(n);--i)
#define ffl(i,r) for(int i=head[r];i!=-1;i=edge[i].next)
#define cc(i,j) memset(i,j,sizeof(i))
#define two(x)			((lng)1<<(x))
#define N 1000
#define M 1000000
#define lson l , mid , rt << 1
#define rson mid + 1 , r , rt << 1 | 1
#define Mod  n
#define Pmod(x) (x%Mod+Mod)%Mod
using namespace std;
typedef vector<int>  vi;
typedef vector<string>  vs;
typedef unsigned int uint;
typedef unsigned lng ulng;
template<class T> inline void checkmax(T &x,T y){if(x<y) x=y;}
template<class T> inline void checkmin(T &x,T y){if(x>y) x=y;}
template<class T> inline T Min(T x,T y){return (x>y?y:x);}
template<class T> inline T Max(T x,T y){return (x<y?y:x);}
template<class T> T gcd(T a,T  b){return (a%b)==0?b:gcd(b,a%b);}
template<class T> T lcm(T a,T b){return a*b/gcd(a,b);}
template<class T> T Abs(T a){return a>0?a:(-a);}
template<class T> inline T lowbit(T n){return (n^(n-1))&n;}
template<class T> inline int countbit(T n){return (n==0)?0:(1+countbit(n&(n-1)));}
template<class T> inline bool isPrimeNumber(T n)
{if(n<=1)return false;for (T i=2;i*i<=n;i++) if (n%i==0) return false;return true;}
template<class T> inline T Minmin(T a,T b,T c,T d){return Min(Min(a,b),Min(c,d));}
struct tarjan_seg{
int head[N],tot,id[N],pre[N],low[N],sta[N],top,n,m,Index,newid,newhead[N],*cur;
struct pp
   {
        int v,next;
    }edge[N*20];
    void add(int u,int v)
    {
        edge[tot].v=v;
        edge[tot].next=cur[u];
        cur[u]=tot++;
    }
    void init()
    {
        cc(head,-1);
        tot=0;
        newid=0;
        cur=head;
        cc(pre,-1);
        cc(low,-1);
        top=0;
        cc(id,-1);
        Index=0;
    }
    void tarjan(int r,int p)
    {
        bool xx=false;
        pre[r]=low[r]=++Index;
        sta[++top]=r;
        ffl(i,r)
        {
            int v=edge[i].v;
            if(v==p&&xx==0)
            {
                xx=1;
                continue;
            }
            if(pre[v]==-1)
            {
                tarjan(v,r);
                checkmin(low[r],low[v]);
            }
            else
            if(id[v]==-1)
            checkmin(low[r],pre[v]);
        }
        if(pre[r]==low[r])
        {
            int v;
            ++newid;
            do
            {
                v=sta[top--];
                id[v]=newid;
            }while(v!=r);
        }
    }
    void solve()
    {
        ff(i,1,n)
        if(pre[i]==-1)
        tarjan(i,-1);
    }
    void build_map()
    {
        int  hash[N]={};
        cur=newhead;
        ff(i,1,n)
        {
            ffl(j,i)
            {
                int v=edge[j].v;
                if(id[i]!=id[v]&&hash[id[i]]!=id[j])
                add(id[i],id[j]),hash[id[i]]=id[j];
            }
        }
    }
    bool two_sat()
    {
        solve();
        for(int i=1;i<=n/2;i+=2)
        if(id[i]==id[i+n/2])
        return false;
        return true;
    }
};
int z;
class ColorfulDecoration
{
    public:
      int getMaximum(vector <int> xa, vector <int> ya, vector <int> xb, vector <int> yb)
      {
          int l=0,r=1000000000,mid;
          z=xa.size();
          while(l<=r)
          {
              mid=(l+r)/2;
              tarjan_seg G;
              G.n=2*z;
              G.init();
            ff(i,0,z-1)
            {
                ff(j,0,z-1)
            {if(i==j) continue;
                else
                if(Abs(xa[i]-xb[j])<mid&&Abs(ya[i]-yb[j])<mid)
                G.add(i+1,j+1),G.add(j+z+1,i+z+1);
                if(Abs(xa[i]-xa[j])<mid&&Abs(ya[i]-ya[j])<mid)
                G.add(i+1,j+z+1),G.add(j+1,i+z+1);
                if(Abs(xb[i]-xb[j])<mid&&Abs(yb[i]-yb[j])<mid)
                G.add(i+z+1,j+1),G.add(j+z+1,i+1);
            }
            }
              if(G.two_sat())
              l=mid+1;
              else
              r=mid-1;
          }
          return r;
      }
};
int main()
{
    ColorfulDecoration K;
    vi k[4];
    k[0].pb(10);
    k[0].pb(4);
    k[0].pb(19);
    k[1].pb(6);
    k[1].pb(19);
    k[1].pb(11);
    k[2].pb(17);
    k[2].pb(8);
    k[2].pb(20);
    k[3].pb(7);
    k[3].pb(9);
    k[3].pb(16);
    cout<<K.getMaximum(k[0],k[1],k[2],k[3]);
    return 0;
}