Submission #534603

#	Time	Username	Problem	Language	Result	Execution time	Memory
534603		alextodoran	Sure Bet (CEOI17_sure)	C++17	100 / 100	88 ms	5076 KiB

sure

/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef long double ld;

const int N_MAX = (int) 1e5;

int n;
ld a[N_MAX + 2];
ld b[N_MAX + 2];

ld f (int i, int j) {
    return min(a[i] - i - j, b[j] - i - j);
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i] >> b[i];
    }
    sort(a + 1, a + n + 1, greater <ld> ());
    sort(b + 1, b + n + 1, greater <ld> ());

    for (int i = 1; i <= n; i++) {
        a[i] += a[i - 1];
        b[i] += b[i - 1];
    }

    ld answer = 0;
    for (int i = 0, j = 0; i <= n; i++) {
        while (j < n && b[j + 1] <= a[i]) {
            j++;
        }
        answer = max(answer, f(i, j));
        if (j + 1 <= n) {
            answer = max(answer, f(i, j + 1));
        }
    }
    cout << fixed << setprecision(4) << answer << "\n";

    return 0;
}

• Subtask 1: 20 / 20
• Subtask 2: 40 / 40
• Subtask 3: 40 / 40