답안 #424415

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
424415	2021-06-11T22:41:57 Z	winstonyin	Mobile (BOI12_mobile)	C++11	100 / 100	963 ms	35476 KB

mobile

#include <string>
#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <vector>
#include <cmath>
#include <array>
#include <map>
#include <set>
#include <fstream>
#include <unordered_map>
#include <queue>
#include <iomanip>
using namespace std;
using pi = pair<int, int>;
using pd = pair<double, double>; 
#define ll long long
#define all(x) (x).begin(), (x).end()

int n_stations, l_highway;
vector<pd> locations; 
bool works(double radius) {
    double curr = 0;
    for(int i = 0; i < n_stations; i++) {
        double delta = sqrt(radius*radius - locations[i].second*locations[i].second);
        double left = locations[i].first - delta, right = locations[i].first + delta;
        if(left <= curr) {
            curr = max(curr, right);
        }
    }
    return curr >= l_highway;
}
int main() {
    ios_base::sync_with_stdio(0);
	cin.tie(0);
    cin >> n_stations >> l_highway;
    for(int i = 0; i < n_stations; i++) {
        double x,y; cin >> x >> y;
        locations.push_back({x,y});
    }
    double a = 0, b = 1.5e9;
    double ans; 
    while(b - a > 1e-3) {
        double m = (a+b)/2.0; 
        if(works(m)) {
            b = m;
            ans = m;
        }
        else {
            a = m;
        }
    }
    cout << fixed << setprecision(4) << ans;
    return 0;
}

Subtask #1
4.0 / 4.0

#	결과	메모리	Grader output
1	Correct	204 KB	Output is correct
2	Correct	204 KB	Output is correct
3	Correct	204 KB	Output is correct
4	Correct	304 KB	Output is correct

Subtask #2
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Correct	0 ms	204 KB	Output is correct
4	Correct	1 ms	204 KB	Output is correct

Subtask #3
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	2 ms	332 KB	Output is correct
2	Correct	3 ms	332 KB	Output is correct
3	Correct	2 ms	332 KB	Output is correct
4	Correct	2 ms	332 KB	Output is correct

Subtask #4
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	5 ms	460 KB	Output is correct
2	Correct	4 ms	524 KB	Output is correct
3	Correct	4 ms	460 KB	Output is correct
4	Correct	5 ms	460 KB	Output is correct

Subtask #5
4.0 / 4.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	460 KB	Output is correct
2	Correct	4 ms	460 KB	Output is correct
3	Correct	4 ms	460 KB	Output is correct
4	Correct	5 ms	412 KB	Output is correct

Subtask #6
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	4 ms	460 KB	Output is correct
2	Correct	6 ms	432 KB	Output is correct
3	Correct	4 ms	460 KB	Output is correct
4	Correct	6 ms	460 KB	Output is correct
5	Correct	4 ms	460 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	63 ms	2368 KB	Output is correct
2	Correct	60 ms	2496 KB	Output is correct
3	Correct	38 ms	1448 KB	Output is correct
4	Correct	65 ms	2480 KB	Output is correct
5	Correct	34 ms	1484 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	56 ms	2404 KB	Output is correct
2	Correct	55 ms	2496 KB	Output is correct
3	Correct	64 ms	2380 KB	Output is correct
4	Correct	68 ms	2496 KB	Output is correct
5	Correct	77 ms	2448 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	58 ms	2448 KB	Output is correct
2	Correct	63 ms	2408 KB	Output is correct
3	Correct	60 ms	2476 KB	Output is correct
4	Correct	99 ms	2424 KB	Output is correct
5	Correct	66 ms	2404 KB	Output is correct

Subtask #10
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	78 ms	2472 KB	Output is correct
2	Correct	75 ms	2420 KB	Output is correct
3	Correct	70 ms	2480 KB	Output is correct
4	Correct	96 ms	2496 KB	Output is correct
5	Correct	79 ms	2524 KB	Output is correct

Subtask #11
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	79 ms	2408 KB	Output is correct
2	Correct	75 ms	2464 KB	Output is correct
3	Correct	72 ms	2476 KB	Output is correct
4	Correct	95 ms	2448 KB	Output is correct
5	Correct	80 ms	2396 KB	Output is correct

Subtask #12
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	336 ms	8628 KB	Output is correct
2	Correct	392 ms	8616 KB	Output is correct
3	Correct	380 ms	8536 KB	Output is correct
4	Correct	473 ms	8624 KB	Output is correct
5	Correct	402 ms	8608 KB	Output is correct

Subtask #13
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	405 ms	8624 KB	Output is correct
2	Correct	447 ms	8624 KB	Output is correct
3	Correct	359 ms	8576 KB	Output is correct
4	Correct	460 ms	8572 KB	Output is correct
5	Correct	414 ms	8640 KB	Output is correct

Subtask #14
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	407 ms	16804 KB	Output is correct
2	Correct	479 ms	16940 KB	Output is correct
3	Correct	463 ms	16832 KB	Output is correct
4	Correct	575 ms	16972 KB	Output is correct
5	Correct	491 ms	23944 KB	Output is correct

Subtask #15
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	485 ms	16820 KB	Output is correct
2	Correct	539 ms	16756 KB	Output is correct
3	Correct	429 ms	16804 KB	Output is correct
4	Correct	570 ms	16748 KB	Output is correct
5	Correct	498 ms	16836 KB	Output is correct

Subtask #16
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	477 ms	16860 KB	Output is correct
2	Correct	554 ms	16912 KB	Output is correct
3	Correct	543 ms	16824 KB	Output is correct
4	Correct	669 ms	16804 KB	Output is correct
5	Correct	567 ms	23796 KB	Output is correct

Subtask #17
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	570 ms	16928 KB	Output is correct
2	Correct	636 ms	23844 KB	Output is correct
3	Correct	512 ms	23204 KB	Output is correct
4	Correct	675 ms	27208 KB	Output is correct
5	Correct	595 ms	24548 KB	Output is correct

Subtask #18
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	546 ms	16800 KB	Output is correct
2	Correct	627 ms	16772 KB	Output is correct
3	Correct	627 ms	24552 KB	Output is correct
4	Correct	765 ms	28760 KB	Output is correct
5	Correct	661 ms	24356 KB	Output is correct

Subtask #19
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	642 ms	16800 KB	Output is correct
2	Correct	711 ms	24000 KB	Output is correct
3	Correct	590 ms	23204 KB	Output is correct
4	Correct	757 ms	28444 KB	Output is correct
5	Correct	667 ms	24624 KB	Output is correct

Subtask #20
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	676 ms	16860 KB	Output is correct
2	Correct	811 ms	31628 KB	Output is correct
3	Correct	773 ms	30640 KB	Output is correct
4	Correct	955 ms	35316 KB	Output is correct
5	Correct	818 ms	29756 KB	Output is correct

Subtask #21
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	804 ms	18124 KB	Output is correct
2	Correct	883 ms	29420 KB	Output is correct
3	Correct	752 ms	28360 KB	Output is correct
4	Correct	963 ms	35476 KB	Output is correct
5	Correct	846 ms	30848 KB	Output is correct

답안 #424415

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