Submission #708303

#	Time	Username	Problem	Language	Result	Execution time	Memory
708303		600Mihnea	Strange Device (APIO19_strange_device)	C++17	100 / 100	732 ms	79040 KiB

strange_device

#include <cmath>
#include <functional>
#include <fstream>
#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <set>
#include <map>
#include <list>
#include <time.h>
#include <math.h>
#include <random>
#include <deque>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <iomanip>
#include <cassert>
#include <bitset>
#include <sstream>
#include <chrono>
#include <cstring>
#include <numeric>
#include <cstdint>
#include <limits>
#include <numeric>
#include <iostream>


using namespace std;

#define int long long

int gcd(int a, int b)
{
	if (b == 0) return a;
	return gcd(b, a % b);
}

signed main() 
{

#ifdef ONPC	
	FILE* stream;
	freopen_s(&stream, "input.txt", "r", stdin);
#else
	ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif

	int n, mod;
	cin >> n;
	{
		int a, b;
		cin >> a >> b;
		a /= gcd(a, b + 1);
		if (a <= ((int)1e18 + 7) / b)
		{
			a *= b;
			mod = a;
		}
		else
		{
			mod = ((int)1e18 + 7);
		}
	}
	map<int, int> mars;
	auto add = [&](int l, int r)
	{
		if (l > r) return;

		mars[l]++;
		mars[r + 1]--;
	};
	vector<pair<int, int>> segs(n);
	for (auto& it : segs)
	{
		cin >> it.first >> it.second;
		if (it.second - it.first + 1 >= mod)
		{
			cout << mod << "\n";
			exit(0);
		}
		int l = it.first % mod, r = it.second % mod;
		if (l <= r)
		{
			add(l, r);
		}
		else
		{
			add(l, mod - 1);
			add(0, r);
		}
	}
	int sol = 0, cur = 0, last;
	for (auto& it : mars)
	{
		if (cur)
		{
			sol += it.first - last;
		}
		last = it.first;
		cur += it.second;
	}
	cout << sol << "\n";
	exit(0);

	return 0;
}

• 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