Submission #258125

#	Time	Username	Problem	Language	Result	Execution time	Memory
258125		amoo_safar	Strange Device (APIO19_strange_device)	C++17	100 / 100	742 ms	69168 KiB

strange_device

// Zende bad Shoma nasime faghat !
#include <bits/stdc++.h>

#define pb push_back
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define debug(x) cerr << #x << " : " << x << '\n'

using namespace std;

typedef __int128 ll;
typedef long double ld;
typedef string str;
typedef pair<ll, ll> pll;

const ll Mod = 1000000007LL;
const int N = 2e5 + 10;
const ll Inf = 2242545357980376863LL;
const ll Log = 30;

int main(){
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	long long n, A, B;
	cin >> n >> A >> B;
	ll z = A / __gcd(A, B + 1);
	ll L = z * B;
	vector<pll> V;

	long long l, r;
	for(int i = 0; i < n; i++){
		cin >> l >> r;
		if(r - l + 1 >= L) return cout << (long long)(L) << '\n', 0;
		if(l % L <= r % L) V.pb({l % L, r % L});
		else {
			V.pb({l % L, L - 1});
			V.pb({0,  r % L});
		}
	}
	sort(all(V));
	ll ans = L;
	ll la = -1;
	for(auto x : V){
		ans -= max(__int128(0), x.F - la - 1);
		la = max(la, x.S);
	}
	ans -= max(__int128(0), L - la - 1);

	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