Submission #363983

#	Time	Username	Problem	Language	Result	Execution time	Memory
363983		MahdiBahramian	Strange Device (APIO19_strange_device)	C++11	100 / 100	2016 ms	106888 KiB

strange_device

#include<bits/stdc++.h>
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define int ll
using namespace std;
typedef long long ll;
const ll INF = 2e18 + 1000;
const int Max = 4e6 + 10;


ll L[Max] , R[Max];
vector<ll> compress;
unordered_map<ll , int> cnv;
int ps[Max];
int val[Max];
int32_t main()
{
	ll n , A , B; cin >> n >> A >> B;
	ll SUM = 0;
	for(int i = 1 ; i <= n ; i++)
	{
		cin >> L[i] >> R[i];
		SUM += R[i] - L[i] + 1;
	}
	if(A / __gcd(A , B + 1) > INF / B)
	{
		cout << SUM << '\n';
		return 0;
	}
	ll md = A * B / __gcd(A , B + 1);
	vector<pair<int , int>> vec;
	for(int i = 1 ; i <= n ; i++)
	{
		if(R[i] - L[i] + 1 >= md)
		{
			cout << md << '\n';
			return 0;
		}
		R[i] %= md;
		L[i] %= md;

		compress.pb(L[i]);
		compress.pb(R[i] + 1);
		if(R[i] < L[i])
		{
			vec.pb(mp(0 , R[i]));
			vec.pb(mp(L[i] , md - 1));
		}
		else vec.pb(mp(L[i] , R[i]));
	}
	compress.pb(0);
	compress.pb(md);
	sort(compress.begin() , compress.end());
	compress.resize(unique(compress.begin() , compress.end()) - compress.begin());
	for(int i = 0 ; i < compress.size() ; i++) cnv[compress[i]] = i;

	for(int i = 0 ; i < vec.size() ; i++)
	{
		//cout << vec[i].F << ',' << vec[i].S << '\n';
		val[cnv[vec[i].F]]++;
		val[cnv[vec[i].S + 1]]--;
	}
	for(int i = 1 ; i < compress.size() ; i++) val[i] += val[i - 1];
	ll res = 0;
	for(int i = 0 ; i < compress.size() - 1 ; i++)
	{
		if(val[i] >= 1)
		{
			res += compress[i + 1] - compress[i];
		}
	}
	cout << '\n';
	cout << res << '\n';
}

Compilation message (stderr)

strange_device.cpp: In function 'int32_t main()':
strange_device.cpp:57:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |  for(int i = 0 ; i < compress.size() ; i++) cnv[compress[i]] = i;
      |                  ~~^~~~~~~~~~~~~~~~~
strange_device.cpp:59:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |  for(int i = 0 ; i < vec.size() ; i++)
      |                  ~~^~~~~~~~~~~~
strange_device.cpp:65:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |  for(int i = 1 ; i < compress.size() ; i++) val[i] += val[i - 1];
      |                  ~~^~~~~~~~~~~~~~~~~
strange_device.cpp:67:20: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for(int i = 0 ; i < compress.size() - 1 ; 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