Submission #568637

#	Time	Username	Problem	Language	Result	Execution time	Memory
568637		four_specks	Strange Device (APIO19_strange_device)	C++17	35 / 100	504 ms	58020 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

inline namespace
{
} // namespace

void solve()
{
    int n;
    long a, b;
    cin >> n >> a >> b;

    vector<array<long, 2>> v(n);
    for (auto &[x, y] : v)
        cin >> x >> y, ++y;

    long c = a * b / gcd(a, b + 1);

    vector<array<long, 2>> u;
    for (auto [x, y] : v)
    {
        if (y - x >= c)
            u.push_back({0, c});
        else
        {
            x %= c, y %= c;
            if (x < y)
                u.push_back({x, y});
            else
                u.push_back({x, c}), u.push_back({0, y});
        }
    }
    sort(u.begin(), u.end());

    long cnt = 0;

    long d = 0;
    for (auto [x, y] : u)
    {
        if (y > d)
        {
            cnt += y - max(x, d);
            d = y;
        }
    }

    cout << cnt << '\n';
}

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

    solve();

    return 0;
}

• Subtask 1: 0 / 10
• Subtask 2: 0 / 5
• Subtask 3: 5 / 5
• Subtask 4: 5 / 5
• Subtask 5: 5 / 5
• Subtask 6: 20 / 20
• Subtask 7: 0 / 20
• Subtask 8: 0 / 30