Submission #393918

#	Time	Username	Problem	Language	Result	Execution time	Memory
393918		ritul_kr_singh	Strange Device (APIO19_strange_device)	C++17	100 / 100	585 ms	53400 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define sp << ' ' <<
#define nl << '\n'

const int INF = 1e18;

signed main(){
	cin.tie(0)->sync_with_stdio(0);

	int n, A, B, l, r; cin >> n >> A >> B;

	int g = A / __gcd(A, B + 1LL);

	if(g > (INF + 5LL) / B) g = INF + 5;
	else g *= B;

	vector<array<int, 2>> q;
	bool all = false;

	while(n--){
		cin >> l >> r;
		int lm = l % g, rm = r % g;
		// if(l + (g - lm) <= r) q.push_back({lm, g-1}), q.push_back({0, rm});
		// else q.push_back({lm, rm});
		all = all or (r - l + 1LL >= g);
		if(lm <= rm) q.push_back({lm, rm});
		else q.push_back({lm, g-1LL}), q.push_back({0, rm});
	}

	int res = 0;
	l = -1, r = -2;
	sort(q.begin(), q.end());

	for(auto &i : q){
		if(r < i[0]){
			res += r - l + 1LL;
			l = i[0], r = i[1];
		}else r = max(r, i[1]);
	}

	res += r - l + 1LL;

	if(all) res = g;

	cout << res;
}

• 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