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답안 #470630

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
470630 2021-09-04T16:07:56 Z zxcvbnm Mobile (BOI12_mobile) C++14
50 / 100
 1000 ms 31636 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
struct P {
    ld x, y;
};
vector<P> a;
int n, L;
bool ok(ld r) {
    ld curr = 0;
    for(int i = 0; i < n; i++) {
        if (r * r < a[i].y * a[i].y) continue;
        ld sol = sqrt(r * r - a[i].y * a[i].y);
        ld left = max((ld) 0, a[i].x - sol);
        ld right = min((ld) L, a[i].x + sol);
        if (left <= curr) {
            curr = max(curr, right);
        }
    }

    return curr >= L;
}
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cin >> n >> L;
    a.resize(n);
    for(auto& i : a) {
        cin >> i.x >> i.y;
    }

    double l = 0, r = 1e9;
    double ans = r;
    for(int rep = 0; rep < 40; rep++) {
        double mid = (l + r) / 2;
        if (rep == 0) mid = 1;
        else if (r > 1) mid = sqrt((long double) l * r);

        if (ok(mid)) {
            r = mid;
            ans = mid;
        }
        else {
            l = mid;
        }
    }

    cout << fixed << setprecision(6) << ans << "\n";
}

Subtask #1
4.0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 0 ms 204 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 1 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 4 ms 404 KB Output is correct
3 Correct 2 ms 332 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 4 ms 460 KB Output is correct
2 Correct 6 ms 460 KB Output is correct
3 Correct 5 ms 460 KB Output is correct
4 Correct 4 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 6 ms 460 KB Output is correct
3 Correct 5 ms 460 KB Output is correct
4 Correct 4 ms 460 KB Output is correct

Subtask #6
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 7 ms 460 KB Output is correct
2 Correct 6 ms 460 KB Output is correct
3 Correct 5 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 78 ms 2636 KB Output is correct
2 Correct 94 ms 2636 KB Output is correct
3 Correct 57 ms 1996 KB Output is correct
4 Correct 61 ms 2636 KB Output is correct
5 Correct 34 ms 1836 KB Output is correct

Subtask #8
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 56 ms 2764 KB Output is correct
2 Correct 53 ms 2508 KB Output is correct
3 Correct 60 ms 2764 KB Output is correct
4 Correct 64 ms 2764 KB Output is correct
5 Correct 73 ms 3020 KB Output is correct

Subtask #9
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 104 ms 3020 KB Output is correct
2 Correct 98 ms 2892 KB Output is correct
3 Correct 88 ms 2892 KB Output is correct
4 Correct 86 ms 3404 KB Output is correct
5 Correct 63 ms 3020 KB Output is correct

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 127 ms 3404 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 122 ms 3404 KB Output is correct
2 Correct 125 ms 3404 KB Output is correct
3 Correct 107 ms 3352 KB Output is correct
4 Correct 86 ms 3404 KB Output is correct
5 Correct 81 ms 3404 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 576 ms 15948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 606 ms 15948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 691 ms 19020 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 735 ms 19100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 814 ms 22100 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #17
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 861 ms 22220 KB Output is correct
2 Correct 730 ms 22220 KB Output is correct
3 Correct 719 ms 22220 KB Output is correct
4 Correct 596 ms 22212 KB Output is correct
5 Correct 537 ms 22204 KB Output is correct

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 922 ms 25284 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 999 ms 25292 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Execution timed out 1082 ms 31620 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 31636 KB Time limit exceeded
2 Halted 0 ms 0 KB -