Submission #167544

#	Time	Username	Problem	Language	Result	Execution time	Memory
167544		qkxwsm	Strange Device (APIO19_strange_device)	C++14	100 / 100	1253 ms	100408 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;

template<class T, class U>
void ckmin(T &a, U b)
{
	if (a > b) a = b;
}
template<class T, class U>
void ckmax(T &a, U b)
{
	if (a < b) a = b;
}

#define MP make_pair
#define PB push_back
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define FOR(i, a, b) for (auto i = (a); i < (b); i++)
#define FORD(i, a, b) for (auto i = (a) - 1; i >= (b); i--)
#define SZ(x) ((int) (x).size())
#define ALL(x) (x).begin(), (x).end()

typedef __int128_t ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;

ll gcd(ll a, ll b)
{
	return (b == 0 ? a : gcd(b, a % b));
}
void readi(ll &x)
{
	long long res;
	cin >> res;
	x = res;
}

int Q;
ll A, B;
ll period, ans;
vpl events;

int32_t main()
{
	ios_base::sync_with_stdio(false); cin.tie(0);
	cout << fixed << setprecision(12);
	cerr << fixed << setprecision(4);
	cin >> Q;
	readi(A); readi(B);
	ll g = gcd(A, B + 1);
	period = B * A / g;
	while(Q--)
	{
		ll L, R;
		readi(L); readi(R);
		if (R - L + 1 >= period)
		{
			cout << (long long) period << '\n';
			return 0;
		}
		L %= period;
		R %= period;
		if (L > R)
		{
			events.PB({L, 1});
			events.PB({period, -1});
			events.PB({0, 1});
			events.PB({R + 1, -1});
		}
		else
		{
			events.PB({L, 1});
			events.PB({R + 1, -1});
		}
	}
	sort(ALL(events));
	int sum = 0;
	FOR(i, 0, SZ(events))
	{
		if (sum)
		{
			ans += (events[i].fi - events[i - 1].fi);
		}
		sum += events[i].se;
	}
	cout << (long long) ans << '\n';
	return 0;
}

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