Submission #589898

#	Time	Username	Problem	Language	Result	Execution time	Memory
589898		boris_mihov	Exhibition (JOI19_ho_t2)	C++14	100 / 100	62 ms	4420 KiB

joi2019_ho_t2

#include <algorithm>
#include <iostream>

typedef long long llong;
const int MAXN = 100000 + 10;

int n, m;
int c[MAXN];
std::pair < int, int > p[MAXN];

bool check(int count)
{
    int from = m - count + 1;
    for (int i = 1 ; i <= n && from <= m ; ++i)
    {
        if (p[i].first <= c[from])
        {
            ++from;
        }
    }

    return from == m+1;
}

void solve()
{
    std::sort(c+1, c+1+m);
    std::sort(p+1, p+1+n, [&](std::pair < int, int > a, std::pair < int, int > b)
    {
        return std::make_pair(a.second, a.first) < std::make_pair(b.second, b.first);
    });

    int l = 0, r = n+1, mid;
    while (l < r - 1)
    {
        mid = (l + r) / 2;
        if (check(mid)) l = mid;
        else r = mid;
    }

    std::cout << l << '\n';
}

void read()
{
    std::cin >> n >> m;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> p[i].first >> p[i].second;
    }

    for (int i = 1 ; i <= m ; ++i)
    {
        std::cin >> c[i];
    }
}

void fastIO()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main ()
{
    fastIO();
    read();
    solve();

    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 40 / 40
• Subtask 3: 50 / 50