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답안 #82076

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
82076 2018-10-29T03:46:57 Z FutymyClone Mobile (BOI12_mobile) C++14
50 / 100
 1000 ms 73952 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 5;
const double eps = 1e-4;

struct Point {
    int x, y;
} a[N];

int n, m;

bool check (double mid) {
    vector <pair <double, double> > vec;
    for (int i = 1; i <= n; i++) {
        //(a[i].x - x)^2 + a[i].y^2 = mid^2
        double cur = mid * mid - 1LL * a[i].y * a[i].y;
        if (cur < 0) continue;
        double lx = -sqrt(cur) + a[i].x;
        double rx = sqrt(cur) + a[i].x;

        if (lx > m || rx < 0) continue;
        lx = max(lx, (double)0);
        rx = min(rx, (double)m);
        vec.push_back({lx, rx});
    }

    sort(vec.begin(), vec.end());
    double pt = 0;
    for (int i = 0; i < vec.size(); i++) {
        if (vec[i].first > pt) return false;
        pt = max(pt, vec[i].second);
    }

    if (pt < m) return false;
    return true;
}

int main(){
    scanf("%d %d", &n, &m);
    for (int i = 1; i <= n; i++) scanf("%d %d", &a[i].x, &a[i].y);

    double l = 0, r = m;
    while (l + eps < r) {
        double mid = (l + r) / 2;
        if (check(mid)) r = mid;
        else l = mid;
    }

    cout << fixed << setprecision(10) << l;
    return 0;
}

Compilation message

mobile.cpp: In function 'bool check(double)':
mobile.cpp:31:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (int i = 0; i < vec.size(); i++) {
                     ~~^~~~~~~~~~~~
mobile.cpp: In function 'int main()':
mobile.cpp:41:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
mobile.cpp:42:39: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     for (int i = 1; i <= n; i++) scanf("%d %d", &a[i].x, &a[i].y);
                                  ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 420 KB Output is correct
4 Correct 2 ms 420 KB Output is correct

Subtask #2
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 2 ms 468 KB Output is correct
2 Correct 2 ms 472 KB Output is correct
3 Correct 2 ms 524 KB Output is correct
4 Correct 3 ms 544 KB Output is correct

Subtask #3
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 548 KB Output is correct
2 Correct 5 ms 724 KB Output is correct
3 Correct 3 ms 744 KB Output is correct
4 Correct 4 ms 852 KB Output is correct

Subtask #4
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 904 KB Output is correct
2 Correct 13 ms 1144 KB Output is correct
3 Correct 12 ms 1144 KB Output is correct
4 Correct 5 ms 1144 KB Output is correct

Subtask #5
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 4 ms 1164 KB Output is correct
2 Correct 14 ms 1392 KB Output is correct
3 Correct 15 ms 1392 KB Output is correct
4 Correct 4 ms 1392 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 1412 KB Output is correct
2 Correct 13 ms 1692 KB Output is correct
3 Correct 13 ms 1692 KB Output is correct
4 Correct 4 ms 1692 KB Output is correct
5 Correct 4 ms 1692 KB Output is correct

Subtask #7
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 4564 KB Output is correct
2 Correct 271 ms 7388 KB Output is correct
3 Correct 140 ms 7388 KB Output is correct
4 Correct 35 ms 7388 KB Output is correct
5 Correct 27 ms 7388 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 28 ms 7524 KB Output is correct
2 Correct 32 ms 8312 KB Output is correct
3 Correct 35 ms 9460 KB Output is correct
4 Correct 36 ms 10612 KB Output is correct
5 Correct 47 ms 12196 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 202 ms 15828 KB Output is correct
2 Correct 300 ms 16656 KB Output is correct
3 Correct 339 ms 17268 KB Output is correct
4 Correct 51 ms 17608 KB Output is correct
5 Correct 34 ms 17756 KB Output is correct

Subtask #10
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 334 ms 22468 KB Output is correct
2 Correct 388 ms 24020 KB Output is correct
3 Correct 473 ms 24512 KB Output is correct
4 Correct 52 ms 24512 KB Output is correct
5 Correct 42 ms 25676 KB Output is correct

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 140 ms 28232 KB Output is correct
2 Correct 419 ms 31080 KB Output is correct
3 Correct 436 ms 31820 KB Output is correct
4 Correct 52 ms 31820 KB Output is correct
5 Correct 42 ms 32848 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1061 ms 54112 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 1062 ms 54112 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 1082 ms 64492 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 1067 ms 64552 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 1066 ms 66892 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 1071 ms 66968 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 1063 ms 69256 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 1060 ms 69316 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 1076 ms 73952 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 1088 ms 73952 KB Time limit exceeded
2 Halted 0 ms 0 KB -