Submission #549897

#	Time	Username	Problem	Language	Result	Execution time	Memory
549897		Hanksburger	Strange Device (APIO19_strange_device)	C++17	100 / 100	515 ms	48856 KiB

strange_device

#include <bits/stdc++.h>
using namespace std;
vector<pair<long long, long long> > vec;
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	long long n, a, b, num, curl, curr, ans=0;
	cin >> n >> a >> b;
	if (log2(a)+log2(b)>=60.0)
		num=2e18;
	else
		num=a*b/gcd(a*b, b+1);
	for (long long i=1; i<=n; i++)
	{
		long long l, r;
		cin >> l >> r;
		if (l+num<=r)
			vec.push_back({0, num-1});
		else if (l%num<=r%num)
			vec.push_back({l%num, r%num});
		else
		{
			vec.push_back({l%num, num-1});
			vec.push_back({0, r%num});
		}
	}
	sort(vec.begin(), vec.end());
	curl=vec[0].first;
	curr=vec[0].second;
	for (long long i=1; i<vec.size(); i++)
	{
		if (curr<vec[i].first)
		{
			ans+=curr-curl+1;
			curl=vec[i].first;
		}
		curr=max(curr, vec[i].second);
	}
	cout << ans+curr-curl+1;
	return 0;
}

Compilation message (stderr)

strange_device.cpp: In function 'int main()':
strange_device.cpp:32:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |  for (long long i=1; i<vec.size(); i++)
      |                      ~^~~~~~~~~~~

• 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