답안 #738461

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
738461	2023-05-08T19:39:13 Z	LKR__enjoyer	Mobile (BOI12_mobile)	C++17	50 / 100	1000 ms	57668 KB

mobile

#include <iostream>
#include<bits/stdc++.h>
#define pb push_back
#define f first
#define s second
typedef long long ll;
typedef long double ld;
using namespace std;
int n,l;
vector<pair<int,int>> pkt;
bool spr(long double rad);
long double bin(ld lo,ld hi)
{
    for(int i=0;i<40;i++)
    {
        ld mid=(lo+hi)/2; 
        if(spr(mid))hi=mid; else lo=mid;
    }
    return lo;
}

int main()
{  ios_base::sync_with_stdio();
 cin.tie();
    cin>>n>>l;
    for(int i=0;i<n;i++)
    {int a,b; cin>>a>>b;
    pkt.pb({a,b});    
    }
    cout<<fixed<<setprecision(4)<<bin(0,(ld)(2*l));
    
    return 0;
}
bool spr(ld rad){
vector<pair<ld,ld>> pts={};
for(auto p : pkt)
{
    ld x=(ld)p.f,y=(ld)p.s;
    if(rad<abs(y))continue; 
    ld del=(ld)sqrt(rad*rad-y*y);
    ld x1=x-del,x2=x+del; 
    pts.pb({x1,x2});
}
if(pts.empty())return 0;
ld curr_min=1.5e9+1,curr_max=-1.5e9-1;
for(auto i : pts)
{ ld a=i.f,b=i.s; if(b<0)continue; 
if(curr_min==1.5e9+1&&curr_max==-1.5e9-1){curr_min=a; curr_max=b; continue;}
if(a<=curr_max)curr_max=max(curr_max,b);
if(b>=curr_min)curr_min=min(curr_min,a);
}
if(curr_min>0||curr_max<(ld)l)return 0;
return 1;    
}

Subtask #1
4.0 / 4.0

#	결과	메모리	Grader output
1	Correct	212 KB	Output is correct
2	Correct	212 KB	Output is correct
3	Correct	212 KB	Output is correct
4	Correct	212 KB	Output is correct

Subtask #2
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	212 KB	Output is correct
2	Correct	1 ms	212 KB	Output is correct
3	Correct	1 ms	212 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct

Subtask #3
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	468 KB	Output is correct
2	Correct	5 ms	544 KB	Output is correct
3	Correct	2 ms	340 KB	Output is correct
4	Correct	5 ms	532 KB	Output is correct

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	724 KB	Output is correct
2	Correct	10 ms	752 KB	Output is correct
3	Correct	6 ms	724 KB	Output is correct
4	Correct	6 ms	724 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	724 KB	Output is correct
2	Correct	12 ms	788 KB	Output is correct
3	Correct	6 ms	724 KB	Output is correct
4	Correct	5 ms	616 KB	Output is correct

Subtask #6
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	756 KB	Output is correct
2	Correct	11 ms	752 KB	Output is correct
3	Correct	6 ms	724 KB	Output is correct
4	Correct	6 ms	724 KB	Output is correct
5	Correct	4 ms	724 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	137 ms	7452 KB	Output is correct
2	Correct	188 ms	7492 KB	Output is correct
3	Correct	101 ms	4172 KB	Output is correct
4	Correct	64 ms	5052 KB	Output is correct
5	Correct	37 ms	2828 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	65 ms	5088 KB	Output is correct
2	Correct	48 ms	5056 KB	Output is correct
3	Correct	60 ms	5144 KB	Output is correct
4	Correct	77 ms	5096 KB	Output is correct
5	Correct	71 ms	5160 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	202 ms	7928 KB	Output is correct
2	Correct	199 ms	7712 KB	Output is correct
3	Correct	111 ms	7148 KB	Output is correct
4	Correct	113 ms	5196 KB	Output is correct
5	Correct	60 ms	5232 KB	Output is correct

Subtask #10
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	227 ms	8424 KB	Output is correct
2	Correct	268 ms	8492 KB	Output is correct
3	Correct	199 ms	7572 KB	Output is correct
4	Correct	100 ms	5300 KB	Output is correct
5	Correct	70 ms	5256 KB	Output is correct

Subtask #11
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	236 ms	8432 KB	Output is correct
2	Correct	278 ms	8428 KB	Output is correct
3	Correct	213 ms	7692 KB	Output is correct
4	Correct	105 ms	5280 KB	Output is correct
5	Correct	77 ms	5204 KB	Output is correct

Subtask #12
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1075 ms	36644 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #13
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1074 ms	36540 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #14
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1051 ms	54604 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #15
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1082 ms	54440 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #16
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1045 ms	55340 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #17
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1078 ms	55204 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #18
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1067 ms	55968 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #19
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1070 ms	55840 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #20
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1076 ms	57436 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #21
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1067 ms	57668 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

답안 #738461

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