Submission #926649

#	Time	Username	Problem	Language	Result	Execution time	Memory
926649		oblantis	Strange Device (APIO19_strange_device)	C++17	0 / 100	1 ms	348 KiB

strange_device

#pragma GCC target("avx2,bmi,bmi2,lzcnt,popcnt")
#pragma GCC optimize("O3,unroll-loops")
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define all(v) v.begin(), v.end()
#define pb push_back
#define ss second
#define ff first
#define vt vector
#define ih __int128
using namespace std;
using namespace __gnu_pbds;
typedef long long ll;
typedef pair<int, int> pii;
typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;
const int mod = 1e9+7;
const ll inf = 1e18 + 1;
const int maxn = 1e6 + 1;
set<pair<ih, ih>> s;
ll ans;
void upd(ll l, ll r){
	if(s.empty())return;
	vt<pair<ih, ih>> del;
	auto i = s.lower_bound({l, inf});
	if(i != s.begin())i--;
	if((*i).ss < l)i++;
	while(i != s.end() && (*i).ff <= r){
		if((*i).ff < l){
			s.insert({(*i).ff, l - 1});
			ans -= l - (*i).ff;
		}
		if((*i).ss > r){
			s.insert({r + 1, (*i).ss});
			ans -= (*i).ss - r;
		}
		del.pb(*i);
		ans += (*i).ss - (*i).ff + 1;
		i++;
	}
	for(auto i : del)s.erase(i);
}
void solve() {
	int n;
	ih a, b;
	ll A, B;
	cin >> n >> A >> B;
	a = A, b = B;
	ih md = a * b / __gcd(a, b + 1);
	s.insert({0, md - 1});
	for(int i = 0; i < n; i++){
		ll l, r;
		cin >> l >> r;
		if(r - l + 1 >= md){
			ans = md;
			return;
		}
		l %= md, r %= md;
		if(l <= r)upd(l, r);
		else upd(0, r), upd(l, md - 1);
	}
	cout << ans;
}

int main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0);
	int times = 1;
	//cin >> times;
	for(int i = 1; i <= times; i++) {
		solve();
	}
	return 0;
}

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