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Submission #856325

# Submission time Handle Problem Language Result Execution time Memory
856325 2023-10-03T06:18:33 Z Alexandruabcde Sure Bet (CEOI17_sure) C++14
100 / 100
 70 ms 3692 KB 
#include <bits/stdc++.h>

using namespace std;

constexpr int NMAX = 1e5 + 5;

int N;

double A[NMAX];
double B[NMAX];

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> N;

    for (int i = 1; i <= N; ++ i ) {
        cin >> A[i] >> B[i];
    }

    sort(A+1, A+N+1);
    sort(B+1, B+N+1);

    for (int i = N - 1; i >= 1; -- i )
        B[i] += B[i+1];

    double answer = 0;
    double sumA = 0;

    for (int i = N+1; i >= 1; -- i ) {
        sumA += A[i];
        int paidA = (N - i + 1);

        int st = 1, dr = N;
        int pos = N + 1;

        while (st <= dr) {
            int mij = (st + dr) / 2;

            double curr_case = min(sumA - paidA - (N - mij + 1), B[mij] - paidA - (N - mij + 1));
            double ant_case = min(sumA - paidA - (N - (mij+1) + 1), B[mij+1] - paidA - (N - (mij+1) + 1));

            if (curr_case >= ant_case) {
                pos = mij;
                dr = mij - 1;
            }
            else st = mij + 1;
        }

        double sumB = B[pos];
        int paidB = N - pos + 1;

        answer = max(answer, min(sumA - paidA - paidB, sumB - paidA - paidB));
    }

    cout << setprecision(4) << fixed << answer << '\n';

    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 468 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 348 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
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 468 KB Output is correct
7 Correct 1 ms 348 KB Output is correct
8 Correct 0 ms 348 KB Output is correct
9 Correct 0 ms 348 KB Output is correct
10 Correct 0 ms 348 KB Output is correct
11 Correct 0 ms 348 KB Output is correct
12 Correct 1 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct
16 Correct 1 ms 348 KB Output is correct
17 Correct 64 ms 3368 KB Output is correct
18 Correct 64 ms 3152 KB Output is correct
19 Correct 70 ms 3404 KB Output is correct
20 Correct 63 ms 3364 KB Output is correct
21 Correct 67 ms 3660 KB Output is correct
22 Correct 67 ms 3152 KB Output is correct
23 Correct 64 ms 3192 KB Output is correct
24 Correct 64 ms 3356 KB Output is correct
25 Correct 67 ms 3160 KB Output is correct
26 Correct 67 ms 3692 KB Output is correct