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답안 #593266

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
593266 2022-07-10T17:16:14 Z hail Mobile (BOI12_mobile) C++17
75 / 100
 1000 ms 18040 KB 
#include <bits/stdc++.h>

using namespace std;

using pld = pair<double, double>;
using ld = double;

#define mp make_pair

int n;
ld l;
vector<pld> station;

pld intercept(pld coor, ld r)
{
    ld mid = pow(r, 2)-pow(coor.second, 2);
    if(mid<0) return mp(-1, -1);
    ld rt_mid = pow(mid , 0.5);
    return mp(coor.first-rt_mid, coor.first+rt_mid);
}

bool check_dist(ld r)
{
    if(r<0) return false;
    pld ret_int;
    ld from_x=0;
    auto it=lower_bound(station.begin(), station.end(), mp(-r, -1e9));
    while(it!=station.end())
    {
        if((*it).first>from_x+r) return false;
        ret_int=intercept(*it, r);
        if(ret_int.first<=from_x && ret_int.second>from_x)
        {
            from_x=ret_int.second;
            if(from_x>=l) return true;
            it = upper_bound(it+1, station.end(), mp(from_x-r, 1e9));
        }
        else it++;
    }
    return false;
}


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

    cout<<setprecision(20); 

    cin>>n>>l;
    station.resize(n);

    ld max_coor{};

    for(int i=0; i<n; i++)
    {
        cin>>station[i].first>>station[i].second;
        max_coor=max({abs(station[i].first), abs(station[i].second), max_coor});
    }

    ld high=2*(max_coor+l);
    ld low=0;
    ld mid;
    while(high-low>=1e-3)
    {
        mid=(high+low)/2;
        if(check_dist(mid)) high=mid;
        else low=mid;
    }

    cout<<high;

}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 320 KB Output is correct
3 Correct 1 ms 300 KB Output is correct
4 Correct 1 ms 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 0 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 340 KB Output is correct
2 Correct 4 ms 340 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 3 ms 332 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 340 KB Output is correct
2 Correct 3 ms 456 KB Output is correct
3 Correct 4 ms 340 KB Output is correct
4 Correct 3 ms 468 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 444 KB Output is correct
2 Correct 3 ms 468 KB Output is correct
3 Correct 3 ms 340 KB Output is correct
4 Correct 5 ms 468 KB Output is correct

Subtask #6
5.0 / 5.0

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

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 62 ms 2120 KB Output is correct
2 Correct 38 ms 2380 KB Output is correct
3 Correct 31 ms 1672 KB Output is correct
4 Correct 41 ms 2088 KB Output is correct
5 Correct 20 ms 1492 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 34 ms 2076 KB Output is correct
2 Correct 34 ms 2088 KB Output is correct
3 Correct 40 ms 2360 KB Output is correct
4 Correct 42 ms 2508 KB Output is correct
5 Correct 51 ms 2880 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 143 ms 2292 KB Output is correct
2 Correct 43 ms 2540 KB Output is correct
3 Correct 51 ms 2424 KB Output is correct
4 Correct 63 ms 2448 KB Output is correct
5 Correct 39 ms 2380 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 56 ms 3104 KB Output is correct
2 Correct 46 ms 3280 KB Output is correct
3 Correct 53 ms 2904 KB Output is correct
4 Correct 62 ms 3788 KB Output is correct
5 Correct 46 ms 3012 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 114 ms 3008 KB Output is correct
2 Correct 47 ms 3108 KB Output is correct
3 Correct 60 ms 2764 KB Output is correct
4 Correct 60 ms 2456 KB Output is correct
5 Correct 48 ms 2508 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1032 ms 9380 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 257 ms 10020 KB Output is correct
2 Correct 456 ms 9412 KB Output is correct
3 Correct 285 ms 9200 KB Output is correct
4 Correct 286 ms 9224 KB Output is correct
5 Correct 248 ms 9292 KB Output is correct

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1018 ms 11044 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 303 ms 11680 KB Output is correct
2 Correct 498 ms 11536 KB Output is correct
3 Correct 350 ms 11608 KB Output is correct
4 Correct 363 ms 11152 KB Output is correct
5 Correct 304 ms 11608 KB Output is correct

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1030 ms 12840 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 352 ms 13304 KB Output is correct
2 Correct 581 ms 12524 KB Output is correct
3 Correct 414 ms 12364 KB Output is correct
4 Correct 416 ms 12364 KB Output is correct
5 Correct 343 ms 12360 KB Output is correct

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1050 ms 14348 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 399 ms 14944 KB Output is correct
2 Correct 711 ms 14236 KB Output is correct
3 Correct 468 ms 13896 KB Output is correct
4 Correct 461 ms 13864 KB Output is correct
5 Correct 389 ms 13884 KB Output is correct

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1087 ms 18040 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 506 ms 18012 KB Output is correct
2 Correct 870 ms 17356 KB Output is correct
3 Correct 591 ms 17012 KB Output is correct
4 Correct 579 ms 15944 KB Output is correct
5 Correct 496 ms 17048 KB Output is correct