답안 #1073885

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1073885	2024-08-25T01:53:10 Z	vjudge1	Mobile (BOI12_mobile)	C++17	40 / 100	1000 ms	89348 KB

mobile

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef long double ld;

int main(){
	ios_base::sync_with_stdio(0); cin.tie(0);

	int n;
	ld L;
	cin >> n >> L;
	vector <pair<ld,ld>> pts(n);
	for(int i=0; i<n; i++){
		cin >> pts[i].first >> pts[i].second;
	}

	const ld EPS = 1e-6;
	ld l=0, r=1e10, mid;
	while(r-l>EPS){
		mid = (l+r)/2;

		vector <pair<ld,ld>> seg;

		for(int i=0; i<n; i++){
			ld x = pts[i].first, y = pts[i].second;
			if(mid <= y){
				continue;
			}
			ld d = sqrt(mid*mid-y*y);
			if(x-d <= L && x+d >= 0)
				seg.push_back({max((ld)0.0, x-d),min((ld)L, x+d)});
		}

		sort(seg.begin(), seg.end());
		vector <pair<ld,ld>> processed;
		for(auto [start,end] : seg){
			if(!processed.empty() && start<=processed.back().second){
				processed.back().second = max(processed.back().second, end);
			}
			else{
				processed.push_back({start, end});
			}
		}

		bool can = false;
		if(processed.size() == 1){
			auto [x,y] = processed[0];
			if(abs(x) < EPS && abs(y-L) < EPS){
				can = true;
			}
		}
		if(can) r = mid;
		else l = mid;
	}
	cout << fixed << setprecision(6) << l << '\n';
	return 0;
}

Subtask #1
4.0 / 4.0

#	결과	메모리	Grader output
1	Correct	348 KB	Output is correct
2	Correct	348 KB	Output is correct
3	Correct	348 KB	Output is correct
4	Correct	348 KB	Output is correct

Subtask #2
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	344 KB	Output is correct
2	Correct	1 ms	348 KB	Output is correct
3	Correct	1 ms	348 KB	Output is correct
4	Correct	1 ms	348 KB	Output is correct

Subtask #3
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	11 ms	772 KB	Output is correct
2	Correct	15 ms	776 KB	Output is correct
3	Correct	9 ms	604 KB	Output is correct
4	Correct	6 ms	756 KB	Output is correct

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	21 ms	1056 KB	Output is correct
2	Correct	28 ms	1048 KB	Output is correct
3	Correct	36 ms	1040 KB	Output is correct
4	Correct	16 ms	1064 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	1040 KB	Output is correct
2	Correct	28 ms	1048 KB	Output is correct
3	Correct	39 ms	1120 KB	Output is correct
4	Correct	15 ms	1036 KB	Output is correct

Subtask #6
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	20 ms	1040 KB	Output is correct
2	Correct	27 ms	1044 KB	Output is correct
3	Correct	39 ms	1036 KB	Output is correct
4	Correct	14 ms	1032 KB	Output is correct
5	Correct	22 ms	1096 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	336 ms	9612 KB	Output is correct
2	Correct	681 ms	10852 KB	Output is correct
3	Correct	435 ms	5872 KB	Output is correct
4	Correct	264 ms	9784 KB	Output is correct
5	Correct	251 ms	5668 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	410 ms	9856 KB	Output is correct
2	Correct	330 ms	10272 KB	Output is correct
3	Correct	348 ms	11052 KB	Output is correct
4	Correct	284 ms	9944 KB	Output is correct
5	Correct	264 ms	10660 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	813 ms	10088 KB	Output is correct
2	Correct	734 ms	9856 KB	Output is correct
3	Correct	952 ms	10852 KB	Output is correct
4	Correct	228 ms	10740 KB	Output is correct
5	Correct	428 ms	11208 KB	Output is correct

Subtask #10
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	726 ms	11192 KB	Output is correct
2	Correct	901 ms	11972 KB	Output is correct
3	Execution timed out	1035 ms	12016 KB	Time limit exceeded
4	Halted	0 ms	0 KB	-

Subtask #11
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	361 ms	10808 KB	Output is correct
2	Correct	939 ms	10816 KB	Output is correct
3	Execution timed out	1079 ms	12632 KB	Time limit exceeded
4	Halted	0 ms	0 KB	-

Subtask #12
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1035 ms	48224 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	1030 ms	52700 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	1050 ms	71352 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	1024 ms	73648 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	1044 ms	74920 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	1047 ms	77496 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	1018 ms	78576 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	1012 ms	81680 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	1043 ms	85796 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	1095 ms	89348 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

답안 #1073885

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