Submission #677177

#	Time	Username	Problem	Language	Result	Execution time	Memory
677177		Melika0gh	Strange Device (APIO19_strange_device)	C++17	100 / 100	1684 ms	31120 KiB

strange_device

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

typedef long long int ll;
typedef long double   ld;
#define sync	ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
#define pb		push_back
#define pii		pair<int, int>
#define mp		make_pair
#define fi		first
#define se		second

const ll inf = 2e18;

int main()
{
	int n;
	ll A, B, AB;
	cin >> n >> A >> B;
	A /= __gcd(A, (B + 1));
	if(inf / A >= B)
		AB = A * B;
	else
		AB = inf;
	
	vector<pair<ll, ll> > vec;
	bool check = false;
	for(int i = 0; i < n; i++)
	{
		ll l, r;
		cin >> l >> r;
		if(check)
		{
			continue;
		}
		if(r - l + 1 >= AB)
		{
			check = true;
			continue;
		}
		r %= AB, l %= AB;
		if(l > r)
		{
			vec.pb(mp(0, r));
			vec.pb(mp(l, AB - 1));
		}
		else
			vec.pb(mp(l, r));
	}
	
	sort(vec.begin(), vec.end());
	ll ans = 0, mx = -1;
	for(auto tmp : vec)
	{
		ll x = tmp.fi, y = tmp.se;
		if(mx < x)
			ans += y - x + 1;
		else
			ans += max(ll(0), y - mx);
		
		mx = max(mx, y);
		
	}
	
	if(check)
		ans = AB;
	
	cout << ans << '\n';
}

• 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