Submission #342725

#	Time	Username	Problem	Language	Result	Execution time	Memory
342725		ogibogi2004	Trampoline (info1cup20_trampoline)	C++14	54 / 100	1996 ms	78748 KiB

trampoline

#include<bits/stdc++.h>
using namespace std;
#define x1 sdfds
#define y1 sdfdfds
#define x2 sdffdsds
#define y2 sdfdds
const int MAXN=2e5+6;
struct trampoline
{
	int x,y;
	bool operator<(trampoline const& other)const
	{
		return make_pair(x,y)<make_pair(other.x,other.y);
	}
};
set<int>xs;
int n,m,k;
vector<trampoline>tr;
map<int,int> newx;
vector<int>xs1;
set<int>ys[MAXN];
vector<int>g[MAXN];
int dp[MAXN][18];
map<pair<int,int>,int> no;
bool vis[MAXN];
int not_root[MAXN];
void dfs(int u,int par)
{
	dp[u][0]=par;
	vis[u]=1;
	for(auto v:g[u])
	{
		if(vis[v])continue;
		dfs(v,u);
	}
}
void precompute()
{
	for(int j=1;j<18;j++)
	{
		for(int i=0;i<tr.size();i++)
		{
			if(dp[i][j-1]==-1)dp[i][j]=-1;
			else dp[i][j]=dp[dp[i][j-1]][j-1];
		}
	}
}
int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cout.tie(NULL);
	cin>>n>>m>>k;
	for(int i=0;i<k;++i)
	{
		int x,y;
		cin>>x>>y;
		xs.insert(x);
		tr.push_back({x,y});
	}
	int cnt=0;
	for(auto xd:xs)
	{
		newx[xd]=++cnt;
		xs1.push_back(xd);
	}
	for(int i=0;i<tr.size();++i)
	{
		ys[newx[tr[i].x]].insert(tr[i].y);
		no[{newx[tr[i].x],tr[i].y}]=i;
	}
	for(int i=0;i<tr.size();++i)
	{
		if(!newx.count(tr[i].x+1))
		{
			continue;
		}
		int x1=newx[tr[i].x+1];
		auto xd=ys[x1].lower_bound(tr[i].y);
		if(xd==ys[x1].end())continue;
		int nxt=no[{x1,(*xd)}];
		//cout<<"da\n";
		g[nxt].push_back(i);
		//cout<<tr[i].x<<" "<<tr[i].y<<" "<<x1<<" "<<(*xd)<<endl;
		//cout<<"* "<<nxt<<"->"<<i<<endl;
		not_root[i]=1;
	}
	for(int i=0;i<tr.size();++i)
	{
		if(vis[i])
		{
			continue;
		}
		if(not_root[i])
		{
			continue;
		}
		dfs(i,-1);
	}
	precompute();
	/*for(int i=0;i<tr.size();i++)
	{
		cout<<i<<"->"<<dp[i][0]<<endl;
	}
	cout<<endl;*/
	int q;
	cin>>q;
	for(int i=0;i<q;++i)
	{
		int x1,y1,x2,y2;
		cin>>x1>>y1>>x2>>y2;
		if(x1==x2)
		{
			cout<<"Yes\n";
			continue;
		}
		if(!newx.count(x1))
		{
			cout<<"No\n";
			continue;
		}
		if(!newx.count(x2-1))
		{
			cout<<"No\n";
			continue;
		}
		int xx=newx[x1];
		auto xd=ys[xx].lower_bound(y1);
		if(xd==ys[xx].end())
		{
			cout<<"No\n";
			continue;
		}
		int u=no[{xx,(*xd)}];
		for(int j=17;j>=0;--j)
		{
			if(dp[u][j]==-1)continue;
			if(tr[dp[u][j]].x<x2)
			{
				u=dp[u][j];
			}
		}
		if(tr[u].x!=x2-1)
		{
			cout<<"No\n";
			continue;
		}
		if(tr[u].y>y2)
		{
			cout<<"No\n";
			continue;
		}
		cout<<"Yes\n";
		continue;
	}
return 0;
}

Compilation message (stderr)

trampoline.cpp: In function 'void precompute()':
trampoline.cpp:41:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trampoline>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   for(int i=0;i<tr.size();i++)
      |               ~^~~~~~~~~~
trampoline.cpp: In function 'int main()':
trampoline.cpp:67:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trampoline>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   67 |  for(int i=0;i<tr.size();++i)
      |              ~^~~~~~~~~~
trampoline.cpp:72:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trampoline>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |  for(int i=0;i<tr.size();++i)
      |              ~^~~~~~~~~~
trampoline.cpp:88:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<trampoline>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   88 |  for(int i=0;i<tr.size();++i)
      |              ~^~~~~~~~~~

• Subtask 1: 23 / 23
• Subtask 2: 20 / 20
• Subtask 3: 11 / 11
• Subtask 4: 0 / 19
• Subtask 5: 0 / 27