题意
给定一个数列,确定选数顺序,假设每次取出为x,要使得ans|x 最大,并且令ans|=x,求选数顺序。
题解
我们可以建一个大根堆,设堆顶为z,判断一下z&ans是否等于0,如果是那就是要选的数,否则就将z弹出,将z-=z&ans放入堆中。
code
#include<cstdio>
#include<algorithm>
#include<queue>
#define fo(i,a,b) for (int (i)=(a);(i)<=(b);(i)++)
using namespace std;
const int N=2e5+5;
typedef long long ll;
int a[N],n,tot;
ll b[40],ans,xx,yy;
struct node{
int x,y;
};
node k;
priority_queue<node> q;
bool operator < (const node &a, const node &b){
return a.x<b.x;
}
int main(){
// freopen("data.in","r",stdin);
int T;
scanf("%d",&T);
b[0]=1;
fo(i,1,30) b[i]=b[i-1]*2;
while (T--){
scanf("%d",&n);
fo(i,1,n) scanf("%d",&a[i]);
fo(i,1,n) q.push((node){a[i],a[i]});
ans=0;
tot=0;
while (tot<n) {
while (1) {
k=q.top();
q.pop();
xx=k.x;
yy=k.y;
if ((ans&xx)) {
xx-=ans&xx;
q.push((node){xx,yy});
}
else{
ans|=xx;
printf("%d ",yy);
tot++;
break;
}
}
}
printf("\n");
}
return 0;
}
标签:node,const,cf,ans,827,include,div
From: https://www.cnblogs.com/ganking/p/16793876.html