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Submission #107957

# Submission time Handle Problem Language Result Execution time Memory
107957 2019-04-26T10:14:27 Z kingfran1907 Sure Bet (CEOI17_sure) C++14
100 / 100
 147 ms 5240 KB 
#include <bits/stdc++.h>
#define X first
#define Y second

using namespace std;
const int maxn = 1e5+10;
const double inf = 10000000000000;

int n;
long double a[maxn], b[maxn];

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

    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i] >> b[i];

    sort(a, a+n); reverse(a, a+n);
    sort(b, b+n); reverse(b, b+n);

    if (n <= 10) {
        long double sol = 0;
        const int lim = 1 << n;
        for (int i = 0; i < lim; i++) {
            for (int j = 0; j < lim; j++) {
                int kol = __builtin_popcount(i) + __builtin_popcount(j);
                long double a = 0;
                long double b = 0;

                for (int x = 0; x < n; x++)
                    if (i & (1 << x)) a += ::a[x];

                for (int x = 0; x < n; x++)
                    if (j & (1 << x)) b += ::b[x];
                sol = max(sol, min(a, b) - kol);
            }
        }
        cout << fixed << setprecision(4) << sol << endl;
        return 0;
    }

    long double sol = 0;
    long double x = 0, y = 0;
    int ptrx = 0, ptry = 0;
    //a[n] = -inf, b[n] = -inf;
    while (ptrx < n || ptry < n) {
        //cout << "debug: " << x << " " << y << endl;
        //system("pause");
        if (ptrx < n && (min(x + a[ptrx] - 1, y - 1) > min(x - 1, y + b[ptry] - 1) || (min(x + a[ptrx] - 1, y - 1) == min(x - 1, y + b[ptry] - 1) && max(x + a[ptrx] - 1, y - 1) > max(x - 1, y + b[ptrx] - 1)))) {
            x += a[ptrx++] - 1.0;
            y -= 1.0;
        } else {
            y += b[ptry++] - 1.0;
            x -= 1.0;
        }
        if (ptrx + ptry == 1) sol = min(x, y);
        else sol = max(sol, min(x, y));
    }
    cout << fixed << setprecision(4) << sol << endl;
    return 0;
}

Subtask #1
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 512 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 74 ms 504 KB Output is correct
4 Correct 76 ms 384 KB Output is correct
5 Correct 90 ms 504 KB Output is correct
6 Correct 85 ms 384 KB Output is correct

Subtask #2
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 512 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 74 ms 504 KB Output is correct
4 Correct 76 ms 384 KB Output is correct
5 Correct 90 ms 504 KB Output is correct
6 Correct 85 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 7 ms 440 KB Output is correct
12 Correct 3 ms 384 KB Output is correct
13 Correct 3 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct

Subtask #3
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 512 KB Output is correct
2 Correct 2 ms 384 KB Output is correct
3 Correct 74 ms 504 KB Output is correct
4 Correct 76 ms 384 KB Output is correct
5 Correct 90 ms 504 KB Output is correct
6 Correct 85 ms 384 KB Output is correct
7 Correct 3 ms 384 KB Output is correct
8 Correct 2 ms 384 KB Output is correct
9 Correct 3 ms 384 KB Output is correct
10 Correct 3 ms 384 KB Output is correct
11 Correct 7 ms 440 KB Output is correct
12 Correct 3 ms 384 KB Output is correct
13 Correct 3 ms 384 KB Output is correct
14 Correct 4 ms 384 KB Output is correct
15 Correct 4 ms 384 KB Output is correct
16 Correct 3 ms 384 KB Output is correct
17 Correct 119 ms 3568 KB Output is correct
18 Correct 147 ms 3576 KB Output is correct
19 Correct 123 ms 3504 KB Output is correct
20 Correct 123 ms 3560 KB Output is correct
21 Correct 108 ms 3512 KB Output is correct
22 Correct 128 ms 4892 KB Output is correct
23 Correct 111 ms 4856 KB Output is correct
24 Correct 102 ms 4912 KB Output is correct
25 Correct 101 ms 4856 KB Output is correct
26 Correct 118 ms 5240 KB Output is correct