2017CCPC QinHuangDao M题

Safest BuildingsTime Limit: 1 Second      Memory Limit: 65536 KBPUBG is a multiplayer online battle royale video game. In the game, up to one hundred players parachute onto an island and scavenge for weapons and equipment to kill others while avoiding getting killed themselves. BaoBao is a big fan of the game, but this time he is having some trouble selecting the safest building.There are  buildings scattering on the island in the game, and we consider these buildings as points on a two-dimensional plane. At the beginning of each round, a circular safe area whose center is located at (0, 0) with radius  will be spawned on the island. After some time, the safe area will shrink down towards a random circle with radius  (). The whole new safe area is entirely contained in the original safe area (may be tangent to the original safe area), and the center of the new safe area is uniformly chosen within the original safe area.The buildings covered by the new safe area is called the safe buildings. Given the radius of the safe areas and the positions of the buildings, BaoBao wants to find all the buildings with the largest probability to become safe buildings.

Input

There are multiple test cases. The first line of input contains an integer , indicating the number of test cases. For each test case:The first line contains three integers  (),  and  (), indicating the number of buildings and the radius of two safe circles.The following  lines each contains 2 integers  and  (), indicating the coordinate of the buildings. Here we assume that the center of the original safe circle is located at , and all the buildings are inside the original circle.It's guaranteed that the sum of  over all test cases will not exceed 5000.

Output

For each test case output two lines.The first line contains an integer , indicating the number of buildings with the highest probability to become safe buildings.The second line contains  integers separated by a space in ascending order, indicating the indices of safest buildings.Please, DO NOT output extra spaces at the end of each line.

Sample Input

2
3 10 5
3 4
3 5
3 6
3 10 4
-7 -6
4 5
5 4

Sample Output

1
1
2
2 3

/*
2017ccpc QingHuangDao M
@author jsphlim
*/
#include<iostream>
#include<algorithm>
using namespace std;
struct point{
int x;
int y;
int index;
int pc;
};
bool cmp(point x,point y){
return x.pc<=y.pc;
}
point p[100005];
point ps[100005];
int main(){
int t,n,r,R;
cin>>t;
while(t--){
cin>>n>>R>>r;
int flag=0;
for(int i=1;i<=n;i++) {cin>>p[i].x>>p[i].y;  p[i].index=i;  p[i].pc=p[i].x*p[i].x+p[i].y*p[i].y;}
int temp;
if(R>2*r){
temp = R-2*r;
}
else{
temp = 2*r-R;
}
int indx = 0;
for(int i=1;i<=n;i++){
if(p[i].pc<=temp*temp){
ps[indx++]=p[i];
}
}

if(indx!=0){
cout<<indx<<endl;
for(int i=0;i<indx-1;i++) cout<<ps[i].index<<" ";
cout<<ps[indx-1].index<<endl;
}
else{
sort(p+1,p+n+1,cmp);
int inx=2;
while(p[1].pc==p[inx].pc) inx++;
cout<<inx-1<<endl;
int sets[10005];
int setsize=0;
for(int i=1;i<inx;i++) sets[setsize++]=p[i].index;
sort(sets,sets+setsize);
for(int i=0;i<setsize-1;i++) cout<<sets[i]<<" ";
cout<<sets[setsize-1]<<endl;
}

}

}

4000