답안 #88100 :: oj.uz

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
88100	2018-12-03T19:47:39 Z	JustInCase	Mobile (BOI12_mobile)	C++17	13 / 100	1000 ms	74296 KB

mobile

#include <bits/stdc++.h>

const int32_t MAX_N = 1e6;
const double EPS = 1e-6;

int32_t n, l;
std::pair< int32_t, int32_t > points[MAX_N + 5];

bool Check(long double r) {
	std::vector< std::pair< long double, bool > > events(2 * n);

	for(int32_t i = 0; i < n; i++) {
		if(r * r < (int64_t) points[i].second * points[i].second) {
			events[2 * i] = { -2.0, 0 };
			events[2 * i + 1] = { -1.0, 1 };
			continue;
		}

		long double x1 = points[i].first - sqrt(r * r - (int64_t) points[i].second * points[i].second);
		long double x2 = points[i].first + sqrt(r * r - (int64_t) points[i].second * points[i].second);
		
		events[2 * i] = { x1, 0 };
		events[2 * i + 1] = { x2, 1 };
	}

	std::sort(events.begin(), events.end());

	if(r == 5.0) {
		for(int32_t i = 0; i < 2 * n; i++) {
			std::cout << "     " << events[i].first << " " << events[i].second << '\n';
		}
	}

	int32_t currCnt = 0;
	for(int32_t i = 0; i < 2 * n; i++) {
		if(events[i].first > 0 && currCnt == 0) {
			return false;
		}

		if(events[i].first > l) {
			break;
		}

		if(events[i].second == 0) {
			currCnt++;
		}
		else {
			currCnt--;
		}

		if(!(events[i].first < 0.0) && currCnt == 0) {
			return false;
		}
	}

	return true;
}

int main() {
	std::ios_base::sync_with_stdio(false);
	std::cin.tie(nullptr);

	std::cin >> n >> l;
	
	for(int32_t i = 0; i < n; i++) {
		std::cin >> points[i].first >> points[i].second;
	}

	int64_t low = 1, high = 1e12;
	long double ans;
	while(low <= high) {
		int64_t mid = (low + high) / 2;

		if(Check(mid / 1000.0)) {
			ans = mid / 1000.0;
			high = mid - 1;
		}
		else {
			low = mid + 1;
		}
	}

	std::cout << std::fixed << std::setprecision(7);
	std::cout << ans << '\n';
}

Subtask #1
0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	376 KB	Output is correct
2	Incorrect	2 ms	376 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #2
0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	3 ms	448 KB	Output is correct
2	Correct	3 ms	528 KB	Output is correct
3	Incorrect	3 ms	528 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #3
0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	23 ms	796 KB	Output is correct
2	Incorrect	20 ms	800 KB	Output isn't correct
3	Halted	0 ms	0 KB	-

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	42 ms	996 KB	Output is correct
2	Correct	40 ms	1000 KB	Output is correct
3	Correct	42 ms	1000 KB	Output is correct
4	Correct	41 ms	1060 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	41 ms	1060 KB	Output is correct
2	Correct	40 ms	1060 KB	Output is correct
3	Correct	43 ms	1060 KB	Output is correct
4	Correct	41 ms	1060 KB	Output is correct

Subtask #6
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	41 ms	1060 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #7
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Incorrect	638 ms	5912 KB	Output isn't correct
2	Halted	0 ms	0 KB	-

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	775 ms	6144 KB	Output is correct
2	Correct	691 ms	6144 KB	Output is correct
3	Correct	788 ms	6600 KB	Output is correct
4	Correct	783 ms	6600 KB	Output is correct
5	Correct	827 ms	6984 KB	Output is correct

Subtask #9
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	981 ms	7068 KB	Output is correct
2	Correct	955 ms	7092 KB	Output is correct
3	Incorrect	894 ms	8216 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #10
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1016 ms	9216 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

Subtask #11
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	808 ms	9296 KB	Output is correct
2	Execution timed out	1049 ms	10704 KB	Time limit exceeded
3	Halted	0 ms	0 KB	-

Subtask #12
0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Execution timed out	1066 ms	38836 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	1078 ms	38912 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	1054 ms	45932 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	1063 ms	45972 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	1062 ms	52980 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	1056 ms	52980 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	1070 ms	60044 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	60048 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	1075 ms	74296 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	74296 KB	Time limit exceeded
2	Halted	0 ms	0 KB	-

답안 #88100

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