Submission #1035212

#	Time	Username	Problem	Language	Result	Execution time	Memory
1035212		Halym2007	Strange Device (APIO19_strange_device)	C++17	100 / 100	333 ms	69824 KiB

strange_device

/*
Shu soragda biz m-dan x_i we y_i gaytalanyar
m-in tapylshynyn prove shu asakda link dushindiryar
https://codeforces.com/blog/entry/67129?#comment-887900
*/
#include <bits/stdc++.h>
using namespace std;
#define ff first
#define ss second
#define sz size()
#define pii pair <ll, ll>
const int N = 1e7 + 5;
#define ll long long
#define pb push_back
vector <pii> v;
ll n, a, b, l[N], r[N];
int main () {
//	freopen ("input.txt", "r", stdin);
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin >> n >> a >> b;
	__int128 m = (__int128)a / __gcd (a, b + 1) * b;	// m - period
	for (int i = 1; i <= n; ++i) {
		cin >> l[i] >> r[i];
	}
	for (int i = 1; i <= n; ++i) {
		if (r[i] - l[i] + 1 >= m) {
			v.pb ({0, m - 1});
			continue;
		}
		if (l[i] % m > r[i] % m) {
			v.pb ({l[i] % m, m - 1});
			v.pb ({0, r[i] % m});
		}
		else {
			v.pb ({l[i] % m, r[i] % m});
		}
	}
	
	sort (v.begin(), v.end());
	ll l1 = v[0].ff, r1 = v[0].ss, jogap = 0;
	for (int i = 1; i < (int)v.sz; ++i) {
		if (v[i].ff <= r1) r1 = max (r1, v[i].ss);
		else if (v[i].ff > r1) {
			jogap += r1 - l1 + 1;
			l1 = v[i].ff; 
			r1 = v[i].ss;
		}
	}
	jogap += r1 - l1 + 1;
	cout << jogap;
}

• 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