Submission #1208640

#	Time	Username	Problem	Language	Result	Execution time	Memory
1208640		k1r1t0	Strange Device (APIO19_strange_device)	C++20	35 / 100	406 ms	31948 KiB

strange_device

#include <bits/stdc++.h>

using namespace std;
#define int long long

const int N = 1100000;

int n, a, b, c, l[N], r[N];
vector<int> tt;

int32_t main() {
	ios::sync_with_stdio(0); cin.tie(0);
	cin >> n >> a >> b;
	c = a * b / gcd(a, b + 1);
	for (int i = 1; i <= n; i++) {
		cin >> l[i] >> r[i];
		if (r[i] - l[i] + 1 >= c) {
			cout << c;
			return 0;
		}
		if (l[i] % c <= r[i] % c) {
			tt.push_back(-(l[i] % c + 1));
			tt.push_back(r[i] % c + 1);
		} else {
			tt.push_back(-1);
			tt.push_back(r[i] % c + 1);
			tt.push_back(-(l[i] % c + 1));
			tt.push_back(c);
		}
	}
	sort(begin(tt), end(tt), [&](int i, int j) {
		return abs(i) < abs(j) || (abs(i) == abs(j) && i < j);
	});
	int ans = 0, last = -1, cnt = 0;
	for (int x : tt) {
		if (x > 0) {
			cnt--;
			if (cnt == 0)
				ans += x - last + 1;
		} else {
			cnt++;
			if (cnt == 1)
				last = -x;
		}
	}
	cout << ans;
}

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