6
19
2016
0

[BZOJ4080] [Wf2014]Sensor Network

随机化乱搞

学习了一下bitset怎么用感觉不错

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<bitset>
#include<algorithm>
using namespace std;
 
const int N=105;
typedef bitset<N> Bt;
 
int n,d,ord[N],CNT=1000;
Bt A[N],nw,ans,can;
 
struct Point{
int x,y;
}poi[N];
 
int Sqr(int x){return x*x;}
int Dist(Point A,Point B){return Sqr(A.x-B.x)+Sqr(A.y-B.y);}
 
int main(){
freopen("4080.in","r",stdin);
freopen("4080.out","w",stdout);
scanf("%d %d",&n,&d);
for(int i=1;i<=n;i++)scanf("%d %d",&poi[i].x,&poi[i].y);
for(int i=1;i<=n;i++){
    for(int j=i+1;j<=n;j++){
        if(Dist(poi[i],poi[j])<=d*d)A[i].set(j),A[j].set(i);
    }
}
for(int i=1;i<=n;i++)ord[i]=i;
while(CNT--){
    can.set();
    nw.reset();
    for(int i=1;i<=n;i++){
        if(can.test(ord[i])){
            nw.set(ord[i]);
            can&=A[ord[i]];
        }
    }
    if(nw.count()>ans.count())ans=nw;
    random_shuffle(ord+1,ord+n+1);
}
printf("%d\n",ans.count());
for(int i=1;i<=n;i++)if(ans.test(i))printf("%d ",i);
return 0;
}
Category: BZOJ | Tags: OI bzoj | Read Count: 535

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