NYOJ 710 外星人的供给站

外星人的供给站

AC

#include<cstdio>
#include<cmath>
#include<algorithm>
using namespace std;
struct radar
{
double left,right;
}a[1005];
bool comp(radar a1,radar a2)
{
return a1.left<a2.left;
}
int main()
{
int n,r,x,y,count,t,i;
double p,len;
scanf("%d",&t);
while(t--)
{
scanf("%d%d",&n,&r);
for(i=0;i<n;i++)
{
scanf("%d%d",&x,&y);
len=sqrt((double)r*r-(double)y*y);
a[i].left=x-len;
a[i].right=x+len;
}
sort(a,a+n,comp);
p=a[0].right;
count=1;
for(i=1;i<n;i++)
{
if(a[i].left>p)
{
count++;
p=a[i].right;
}
else
{
if(a[i].right<p)
p=a[i].right;
}
}
printf("%d\n",count);
}
return 0;
}

//runtimeerror

import java.util.LinkedList;
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int N = input.nextInt();
while(N-->0){
int n=input.nextInt();
int r=input.nextInt();
LinkedList<XXX> list=new LinkedList<XXX>();
XXX xx;
for(int i=0;i<n;i++){
int x=input.nextInt();
int y=input.nextInt();
double c=Math.sqrt(r*r*2)/2;
xx=new XXX(x-c,x+c);
list.add(xx);
}
//int s=list.size();
for(int i=0;i<list.size();i++){

for(int j=i+1;j<list.size();j++){
XXX aa=list.get(i);
XXX bb=list.get(j);
if(aa.a<=bb.b&&aa.b>=bb.b){
aa.b=bb.b;
list.remove(i);
list.add(i, aa);
list.remove(j);
//--s;
continue;
}
if(aa.a<=bb.a&&aa.b>=bb.a){
aa.a=bb.a;
list.remove(i);
list.add(i, aa);
list.remove(j);
//--s;
continue;
}
if(aa.a<=bb.a&&aa.b>=bb.b){
aa.b=bb.b;
aa.a=bb.a;
list.remove(i);
list.add(i, aa);
list.remove(j);
//--s;
continue;
}
if(aa.a>=bb.a&&aa.b<=bb.b){
list.remove(j);
//--s;
}
}
}
System.out.println(list.size());
}
}
}
class XXX{
double a;
double b;
XXX(double a,double b){
this.a=a;
this.b=b;
}
XXX(){
}
}

//运行时间错误

import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int N = input.nextInt();
while(N-->0){
int n=input.nextInt();
int r=input.nextInt();
XXX xx[]=new XXX
;
for(int i=0;i<n;i++){
int x=input.nextInt();
int y=input.nextInt();
double c=Math.sqrt(r*r-y*y);
xx[i]=new XXX(x-c,x+c);
}
for(int i=0;i<n;i++){
for(int j=i+1;j<n;j++){
if(xx[i].a>xx[j].a){
XXX c=xx[i];
xx[i]=xx[j];
xx[j]=c;
}
}
}
double p=xx[0].b;
int e=1;
for(int i=1;i<n;i++){
if(xx[i].a>p){
e++;
p=xx[i].b;
}
else if(xx[i].b<p)
p=xx[i].b;
}
System.out.println(e);
}
}
}
class XXX{
double a;
double b;
XXX(double a,double b){
this.a=a;
this.b=b;
}
XXX(){
}
}