Submission #579492

#	Time	Username	Problem	Language	Result	Execution time	Memory
579492		gun_gan	Strange Device (APIO19_strange_device)	C++17	65 / 100	921 ms	163728 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

int main()
{
	cin.tie(0) -> ios_base::sync_with_stdio(0);

	ll n, a, b;
	cin >> n >> a >> b;

	ll g = a * b / gcd(a, b + 1);

	map<ll, vector<ll>> M;
	for(int i = 0; i < n; i++)
	{
		ll l, r;
		cin >> l >> r;
		l %= g, r %= g;
		if(r < l)
		{
			M[0].push_back(r);
			M[l].push_back(g - 1);
		}
		else
		{
			M[l].push_back(r);
		}
	}

	multiset<ll> S;
	vector<pair<ll,ll>> intervals;

	ll begin = 2e18, last = 0;
	for(auto &[st, v] : M)
	{	
		
		while(!S.empty() && *S.begin() < st)
		{
			S.erase(S.begin());
		}

		if(S.empty() && begin != 2e18)
		{
			intervals.push_back({begin, last});
			begin = 2e18;
			last = 0;
		}

		begin = min(begin, st);

		for(auto i : v)
		{
			S.insert(i);
			last = max(last, i);
		}

	}

	if(!S.empty() && begin != 2e18)
	{
		while(!S.empty())
		{
			last = max(last, *S.begin());
			S.erase(S.begin());
		}

		intervals.push_back({begin, last});
	}

	long long ans = 0;
	for(auto [l, r] : intervals) 
	{
		ans += r - l + 1;
	}
	cout << ans;

}

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