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Submission #995185

# Submission time Handle Problem Language Result Execution time Memory
995185 2024-06-08T15:17:13 Z VMaksimoski008 Mobile (BOI12_mobile) C++17
30 / 100
 1000 ms 48228 KB 
#include <bits/stdc++.h>

#define sz(x) (int)x.size()
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define int long long

using namespace std;

using ll = long long;
using ull = unsigned long long;
using ld = long double;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<double, double>;

const int mod = 1e9 + 7;
const int LOG = 20;
const int maxn = 1e5 + 5;
const double eps = 1e-9;

int32_t main() {
    int n, L, mn=1e9;
    cin >> n >> L;

    vector<int> x(n), y(n);
    for(int i=0; i<n; i++) cin >> x[i] >> y[i], mn = min(mn, y[i]);

    double l=mn, r=1e10, ans=r;
    // double l = 5.545455, r=10, ans=r;
    for(int it=0; it<350; it++) {
        double mid = (l + r) / 2.0;
        vector<pdd> seg;
        //cout << mid << '\n';

        for(int i=0; i<n; i++) {
            if(abs(y[i]) >= mid) continue;
            double len = sqrt(mid * mid - y[i] * y[i]);
            double left = x[i] - len, right = x[i] + len;
            if( right >= 0 && left <= L ) seg.push_back({ max((double)0, x[i] - len), min((double)L, x[i] + len) });
            //cout << seg.back().first << " " << seg.back().second << '\n';
        }

        if(seg.size() == 0) {
            l = mid;
            continue;
        }

        sort(seg.begin(), seg.end());
        bool ok = 1;

        double lp=seg[0].first, rp=seg[0].second;
        if(lp > 0) ok = 0;

        for(int i=1; i<seg.size(); i++) {
            if(seg[i].first > rp) ok = 0;
            rp = max(rp, seg[i].second);
        }

        if(ok && rp >= L) ans = min(ans, mid), r = mid;
        else l = mid;
    }

    cout << setprecision(8) << fixed << ans << '\n';
    return 0;
}

Compilation message

mobile.cpp: In function 'int32_t main()':
mobile.cpp:55:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<double, double> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int i=1; i<seg.size(); i++) {
      |                      ~^~~~~~~~~~~

Subtask #1
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct

Subtask #2
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 1 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 1 ms 348 KB Output is correct

Subtask #3
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 348 KB Output is correct
2 Correct 18 ms 580 KB Output is correct
3 Correct 3 ms 348 KB Output is correct
4 Correct 9 ms 468 KB Output is correct

Subtask #4
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 968 KB Output is correct
2 Correct 50 ms 728 KB Output is correct
3 Correct 49 ms 728 KB Output is correct
4 Correct 8 ms 716 KB Output is correct

Subtask #5
4.0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 732 KB Output is correct
2 Correct 49 ms 740 KB Output is correct
3 Correct 50 ms 716 KB Output is correct
4 Correct 8 ms 728 KB Output is correct

Subtask #6
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 20 ms 732 KB Output is correct
2 Correct 46 ms 712 KB Output is correct
3 Correct 92 ms 724 KB Output is correct
4 Correct 8 ms 728 KB Output is correct
5 Correct 10 ms 720 KB Output is correct

Subtask #7
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 355 ms 4848 KB Output is correct
2 Execution timed out 1061 ms 5800 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #8
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 129 ms 5032 KB Output is correct
2 Correct 118 ms 4756 KB Output is correct
3 Correct 128 ms 5036 KB Output is correct
4 Correct 117 ms 4992 KB Output is correct
5 Correct 115 ms 5208 KB Output is correct

Subtask #9
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1039 ms 5296 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #10
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1020 ms 6204 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #11
0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 438 ms 5584 KB Output is correct
2 Execution timed out 1053 ms 5656 KB Time limit exceeded
3 Halted 0 ms 0 KB -

Subtask #12
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1008 ms 24304 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #13
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1026 ms 24352 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #14
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1066 ms 37456 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #15
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1070 ms 36276 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #16
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1031 ms 39816 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #17
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1053 ms 39612 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #18
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1065 ms 43448 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #19
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1037 ms 42324 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #20
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1040 ms 48228 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #21
0 / 5.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1058 ms 48160 KB Time limit exceeded
2 Halted 0 ms 0 KB -