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Submission #866902

# Submission time Handle Problem Language Result Execution time Memory
866902 2023-10-27T09:50:40 Z sleepntsheep Sure Bet (CEOI17_sure) C++17
20 / 100
 36 ms 2548 KB 
#include <cstdio>
#include <iomanip>
#include <cstring>
#include <cassert>
#include <string>
#include <deque>
#include <vector>
#include <map>
#include <queue>
#include <algorithm>
#include <iostream>
#include <utility>
using namespace std;
using ll = long long;
using ld = long double;
#define ShinLena cin.tie(nullptr)->sync_with_stdio(false)

#define N 200005
#define ALL(x) x.begin(), x.end()

int n;
ld a[N], b[N];

int ok(ld x)
{
    for (int take = 0; take <= 2*n; ++take)
    {
        int l = n-take, r = n-1, L=-1, R=-1;
        while (l <= r)
        {
            int y = (l+r)/2;
            if (a[y] - take >= x) l=y+1, L=y;
            else r=y-1;
        }
        if (L==-1) continue;
        R = n-take+(n-L);
        if (b[R] - take >= x) return 1;
    }
    return 0;
}

int main()
{
    ShinLena;
    cin >> n;
    for (int i = 0; i < n; ++i) cin >> a[i] >> b[i];
    sort(a, a+n), sort(b, b+n);
    for (int i = n; i--;) a[i] += a[i+1], b[i] += b[i+1];

    ld l = 0, r = 1e9, iter=1000;
    for (; --iter;)
    {
        ld y = (l+r)/2;
        if (ok(y)) l = y;
        else r = y;
    }
    cout << fixed << setprecision(4) << l;

    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct

Subtask #2
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 3 ms 2392 KB Output is correct
9 Correct 3 ms 2392 KB Output is correct
10 Correct 2 ms 2396 KB Output is correct
11 Correct 3 ms 2396 KB Output is correct
12 Correct 16 ms 2548 KB Output is correct
13 Correct 21 ms 2548 KB Output is correct
14 Correct 36 ms 2544 KB Output is correct
15 Incorrect 28 ms 2396 KB Output isn't correct
16 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 1 ms 2392 KB Output is correct
3 Correct 1 ms 2396 KB Output is correct
4 Correct 1 ms 2392 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 2 ms 2396 KB Output is correct
8 Correct 3 ms 2392 KB Output is correct
9 Correct 3 ms 2392 KB Output is correct
10 Correct 2 ms 2396 KB Output is correct
11 Correct 3 ms 2396 KB Output is correct
12 Correct 16 ms 2548 KB Output is correct
13 Correct 21 ms 2548 KB Output is correct
14 Correct 36 ms 2544 KB Output is correct
15 Incorrect 28 ms 2396 KB Output isn't correct
16 Halted 0 ms 0 KB -