제출 #1136330

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1136330		bpptidp	Trampoline (info1cup20_trampoline)	C++20	0 / 100	759 ms	142244 KiB

trampoline

#include<bits/stdc++.h>
using namespace std;
using ll=long long;

int R,C,n,t;
map<array<int,2>,int>hsh;
map<int,array<int,2>>dehsh;
vector<array<int,2>>zel,st,en;

unordered_map<int,set<int>>rw;
map<array<int,2>,bool>ok;
map<int,int>comp;

const int N=2e4+7;
vector<int>g[N];

bitset<N>msk[N];

vector<int>cur;
int vis[N];

void dfs(int u){
	cur.push_back(u);
	msk[u]=0;
	msk[u][u]=1;
	vis[u]=1;
	for(int v:g[u]){
		if(!vis[v])dfs(v);
		msk[u]|=msk[v];
	}
}

bool bad(array<int,2>a,array<int,2>b){
	int x1=a[0],y1=a[1];
	int x2=b[0],y2=b[1];
	if(x1>x2)return 1;
	if(y1>y2)return 1;
	return 0;
}

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);

    cin>>R>>C>>n;
    for(int i=0,x,y;i<n;++i){
    	cin>>x>>y;
    	zel.push_back({x,y});
    }

    cin>>t;
    for(int i=0,x,y;i<t;++i){
    	cin>>x>>y;
    	st.push_back({x,y});
    	cin>>x>>y;
    	en.push_back({x,y});
    }

    set<array<int,2>>ss;
    for(auto&x:zel)ss.insert(x);
    for(auto&x:st)ss.insert(x);
   	for(auto&x:en)ss.insert(x);

   	int cc=0;
    for(auto&x:ss){
    	hsh[x]=++cc;
    	dehsh[cc]=x;
    }

    for(auto&[x,y]:st)
    	rw[x].insert(y);
    for(auto&[x,y]:en)
    	rw[x].insert(y);
    for(auto&[x,y]:zel)
    	rw[x].insert(y);

    for(auto&[x,s]:rw){
    	int pr=-1;
    	for(auto&y:s){
    		int cur=hsh[{x,y}];
    		if(pr!=-1)g[pr].push_back(cur);
    		pr=cur;
    	}
    }

    //for(auto&[x,y]:hsh)
    //	cout<<x[0]<<' '<<x[1]<<':'<<' '<<y<<endl;
    //cout<<endl;

    for(auto&[x,y]:zel){
    	auto it=rw[x+1].lower_bound(y);
    	if(it==rw[x+1].end())continue;
    	g[hsh[{x,y}]].push_back(hsh[{x+1,*it}]);
    }

    int c2=1;
    for(int i=1;i<=cc;++i){
    	if(!vis[i]){
    		cur.clear();
    		dfs(i);
    		for(auto&x:cur)comp[x]=c2;
    		++c2;
    	}
    }

    //for(int i=0;i<N;++i){
    //	if(g[i].size()){
    //		for(int j:g[i])
    //			cout<<i<<' '<<j<<endl;
    //	}
    //}
    //cout<<endl;

    for(int i=0;i<t;++i){
    	int fi=hsh[st[i]];
    	int se=hsh[en[i]];
    	//cout<<fi<<' '<<tin[fi]<<' '<<se<<' '<<tin[se]<<' '<<comp[fi]<<' '<<comp[se]<<endl;
    	ok[{fi,se}]=msk[fi][se];
    	ok[{fi,se}]&=(comp[fi]==comp[se]);
    }

    for(int i=0;i<t;++i){
    	if(bad(st[i],en[i]))cout<<"No\n";
    	else cout<<(ok[{hsh[st[i]],hsh[en[i]]}]?"Yes\n":"No\n");
    }
}

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