oj.uz

답안 #470634

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
470634 2021-09-04T16:11:46 Z zxcvbnm Mobile (BOI12_mobile) C++14
9 / 100
 490 ms 15980 KB 
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
struct P {
    ll x, y;
};
vector<P> a;
int n, L;
bool ok(double r) {
    double curr = 0;
    for(int i = 0; i < n; i++) {
        if (r * r < a[i].y * a[i].y) continue;
        double sol = sqrt(r * r - a[i].y * a[i].y);
        double left = max((double) 0, a[i].x - sol);
        double right = min((double) 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 < 39; rep++) {
        double mid = (l + r) / 2;

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

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

Subtask #1
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 1 ms 332 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Correct 1 ms 204 KB Output is correct
2 Incorrect 1 ms 204 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 4.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 2 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
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 #5
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 3 ms 332 KB Output is correct
4 Incorrect 3 ms 332 KB Output isn't correct

Subtask #6
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 4 ms 332 KB Output is correct
3 Incorrect 3 ms 332 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #7
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 36 ms 1484 KB Output is correct
2 Incorrect 36 ms 1484 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #8
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 32 ms 1484 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #9
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 39 ms 1612 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 50 ms 1868 KB Output is correct
2 Correct 49 ms 1868 KB Output is correct
3 Incorrect 42 ms 1868 KB Output isn't correct
4 Halted 0 ms 0 KB -

Subtask #11
5.0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 49 ms 1868 KB Output is correct
2 Correct 57 ms 1868 KB Output is correct
3 Correct 43 ms 1868 KB Output is correct
4 Correct 40 ms 1868 KB Output is correct
5 Correct 39 ms 1868 KB Output is correct

Subtask #12
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 227 ms 8140 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 244 ms 8140 KB Output is correct
2 Incorrect 266 ms 8140 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 265 ms 9676 KB Output is correct
2 Incorrect 289 ms 9704 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 293 ms 9652 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 302 ms 11212 KB Output is correct
2 Incorrect 342 ms 11212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 355 ms 11212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 347 ms 12748 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 388 ms 12748 KB Output is correct
2 Incorrect 399 ms 12748 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 439 ms 15948 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# 결과 실행 시간 메모리 Grader output
1 Correct 485 ms 15948 KB Output is correct
2 Incorrect 490 ms 15980 KB Output isn't correct
3 Halted 0 ms 0 KB -