답안 #1031428

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1031428	2024-07-22T20:27:18 Z	shezitt	Mobile (BOI12_mobile)	C++14	100 / 100	416 ms	15964 KB

mobile

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

#define int ll
#define vi vector<int>
#define ii pair<int,int>
#define x first
#define y second
#define fore(a, b, c) for(int a=b; a<c; ++a)
#define all(x) x.begin(), x.end()
#define sz(x) (int)x.size()
#define endl '\n'
#define dbg(x) cerr << #x << ": " << x << endl
#define raya cerr << "================" << endl;

double eps = 1e-4;

signed main(){

    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    int n, len;
    cin >> n >> len;

    vector<ii> p(n);
    fore(i, 0, n){
        cin >> p[i].x >> p[i].y;
    }

    double low = 0, high = 1e9+5;

    while((high - low) > eps){
        double mid = low + (high - low) / 2;
        
        double mx = 0;

        fore(i, 0, n){
            // double delta = (2*p[i].x)*(2*p[i].x)-4*(p[i].x*p[i].x+p[i].y*p[i].y-mid*mid);
            // double a = (2*p[i].x - sqrt(delta)) / 2;
            // double b = (2*p[i].x + sqrt(delta)) / 2;

            // simplificando:
            double delta = mid * mid - p[i].y * p[i].y;
            double a = p[i].x - sqrt(delta);
            double b = p[i].x + sqrt(delta);
            
            if(a <= mx){
                mx = max(mx, b);
            }
        }

        if(mx >= len){
            high = mid;
        } else {
            low = mid;
        }

    }

    cout << fixed << setprecision(6) << high;

}

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	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 #3
4.0 / 4.0

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

Subtask #4
4.0 / 4.0

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

Subtask #5
4.0 / 4.0

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

Subtask #6
5.0 / 5.0

#	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	2 ms	348 KB	Output is correct
5	Correct	3 ms	348 KB	Output is correct

Subtask #7
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	30 ms	1628 KB	Output is correct
2	Correct	18 ms	1628 KB	Output is correct
3	Correct	14 ms	1116 KB	Output is correct
4	Correct	31 ms	1628 KB	Output is correct
5	Correct	14 ms	1112 KB	Output is correct

Subtask #8
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	26 ms	1628 KB	Output is correct
2	Correct	25 ms	1372 KB	Output is correct
3	Correct	29 ms	1628 KB	Output is correct
4	Correct	31 ms	1880 KB	Output is correct
5	Correct	35 ms	1628 KB	Output is correct

Subtask #9
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	22 ms	1628 KB	Output is correct
2	Correct	20 ms	1628 KB	Output is correct
3	Correct	28 ms	1628 KB	Output is correct
4	Correct	43 ms	1884 KB	Output is correct
5	Correct	30 ms	1624 KB	Output is correct

Subtask #10
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	24 ms	1884 KB	Output is correct
2	Correct	24 ms	1884 KB	Output is correct
3	Correct	26 ms	1880 KB	Output is correct
4	Correct	43 ms	1880 KB	Output is correct
5	Correct	35 ms	1880 KB	Output is correct

Subtask #11
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	24 ms	1880 KB	Output is correct
2	Correct	27 ms	1884 KB	Output is correct
3	Correct	25 ms	1880 KB	Output is correct
4	Correct	42 ms	1884 KB	Output is correct
5	Correct	35 ms	1884 KB	Output is correct

Subtask #12
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	107 ms	8284 KB	Output is correct
2	Correct	124 ms	8284 KB	Output is correct
3	Correct	117 ms	8284 KB	Output is correct
4	Correct	207 ms	8192 KB	Output is correct
5	Correct	176 ms	8284 KB	Output is correct

Subtask #13
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	122 ms	8284 KB	Output is correct
2	Correct	227 ms	8284 KB	Output is correct
3	Correct	125 ms	8280 KB	Output is correct
4	Correct	214 ms	8280 KB	Output is correct
5	Correct	174 ms	8280 KB	Output is correct

Subtask #14
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	130 ms	9820 KB	Output is correct
2	Correct	145 ms	9820 KB	Output is correct
3	Correct	142 ms	9820 KB	Output is correct
4	Correct	253 ms	9816 KB	Output is correct
5	Correct	235 ms	9816 KB	Output is correct

Subtask #15
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	151 ms	9820 KB	Output is correct
2	Correct	254 ms	9820 KB	Output is correct
3	Correct	140 ms	9820 KB	Output is correct
4	Correct	245 ms	9820 KB	Output is correct
5	Correct	221 ms	9820 KB	Output is correct

Subtask #16
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	150 ms	11356 KB	Output is correct
2	Correct	167 ms	11352 KB	Output is correct
3	Correct	158 ms	11352 KB	Output is correct
4	Correct	268 ms	11356 KB	Output is correct
5	Correct	249 ms	11352 KB	Output is correct

Subtask #17
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	162 ms	11352 KB	Output is correct
2	Correct	294 ms	11352 KB	Output is correct
3	Correct	167 ms	11352 KB	Output is correct
4	Correct	289 ms	11352 KB	Output is correct
5	Correct	234 ms	11352 KB	Output is correct

Subtask #18
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	153 ms	12892 KB	Output is correct
2	Correct	170 ms	12892 KB	Output is correct
3	Correct	177 ms	13144 KB	Output is correct
4	Correct	338 ms	12892 KB	Output is correct
5	Correct	304 ms	12892 KB	Output is correct

Subtask #19
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	188 ms	12888 KB	Output is correct
2	Correct	313 ms	12892 KB	Output is correct
3	Correct	244 ms	12892 KB	Output is correct
4	Correct	308 ms	12892 KB	Output is correct
5	Correct	304 ms	12888 KB	Output is correct

Subtask #20
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	209 ms	15964 KB	Output is correct
2	Correct	240 ms	15964 KB	Output is correct
3	Correct	233 ms	15964 KB	Output is correct
4	Correct	386 ms	15960 KB	Output is correct
5	Correct	395 ms	15960 KB	Output is correct

Subtask #21
5.0 / 5.0

#	결과	실행 시간	메모리	Grader output
1	Correct	229 ms	15964 KB	Output is correct
2	Correct	416 ms	15964 KB	Output is correct
3	Correct	263 ms	15960 KB	Output is correct
4	Correct	412 ms	15960 KB	Output is correct
5	Correct	372 ms	15960 KB	Output is correct

답안 #1031428

Compilation message