Submission #1015088

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015088		vjudge1	Boat (APIO16_boat)	C++17	31 / 100	2047 ms	454396 KiB

boat

#include <bits/stdc++.h>

using namespace std;

const int M = 1e6 + 1, mod = 1e9 + 7;

int fen[M+1];

void modify(int p,int x)
{
	p++;
	while (p<=M)
	{
		fen[p]+=x;
		fen[p]%=mod;
		p+=p&-p;
	}
}

int get(int p)
{
	int ans=0;
	p++;
	while (p)
	{
		ans+=fen[p];
		ans%=mod;
		p-=p&-p;
	}
	return ans;
}

int main()
{
	int n;
	cin>>n;
	int a[n],b[n];
	set<int> se;
	for (int i=0;i<n;i++)
	{
		cin>>a[i]>>b[i];
		for (int j=a[i];j<=b[i];j++)
			se.insert(j);
	}
	map<int,int> mp;
	for (int i:se)
		mp[i]=mp.size()+1;
	modify(0,1);
	for (int i=0;i<n;i++)
	{
		a[i]=mp[a[i]],b[i]=mp[b[i]];
		for (int j=b[i];j>=a[i];j--)
			modify(j,get(j-1));
	}
	cout<<get(M)-1<<endl;
	
	return 0;
}

• Subtask 1: 9 / 9
• Subtask 2: 22 / 22
• Subtask 3: 0 / 27
• Subtask 4: 0 / 42