Submission #1010171

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010171		LCJLY	Trampoline (info1cup20_trampoline)	C++14	0 / 100	2102 ms	87672 KiB

trampoline

#include <bits/stdc++.h>
using namespace std;
	
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<int,int>pii;
typedef array<int,3>pi2;

vector<int>adj[200005];
bool visited[200005];
int two[22][200005];

void dfs(int index, int par){
	for(int x=0;x<20;x++){
		two[x+1][index]=two[x][two[x][index]];
	}
	for(auto it:adj[index]){
		if(it==par) continue;
		two[0][it]=index;
		dfs(it,index);
	}
}

void solve(){	
	int n,m,k;
	cin >> n >> m >> k;
	
	pii arr[k];
	map<int,vector<int>>mp;
	for(int x=0;x<k;x++){
		cin >> arr[x].first >> arr[x].second;
		mp[arr[x].first].push_back(arr[x].second);
	}
	
	int ptr=0;
	map<pii,int>mp2;
	unordered_map<int,pii>hash;
	
	for(auto &it:mp){
		sort(it.second.begin(),it.second.end());
		for(auto it2:it.second){
			hash[ptr]={it.first,it2};
			mp2[{it.first,it2}]=ptr++;
		}
	}
	
	for(auto it:mp){
		int nxt=it.first+1;
		if(mp.find(nxt)!=mp.end()){
			for(auto hold:it.second){
				int index=lower_bound(mp[nxt].begin(),mp[nxt].end(),hold)-mp[nxt].begin();
				if(index<(int)mp[nxt].size()){
					adj[mp2[{it.first,hold}]].push_back(mp2[{nxt,mp[nxt][index]}]);
					adj[mp2[{nxt,mp[nxt][index]}]].push_back(mp2[{it.first,hold}]);
				}
			}
		}
	}
	
	//for(auto it:mp2){
		//show3(a,it.first.first,b,it.first.second,index,it.second);
	//}
	
	auto cur=mp.end();
	while(cur!=mp.begin()){
		cur--;
		int sz=cur->second.size();
		for(int y=sz-1;y>=0;y--){
			int index=mp2[{cur->first,cur->second[y]}];
			if(visited[index]) continue;
			dfs(index,-1);
		}
	}
	
	int q;
	cin >> q;
	
	pii st,ed;
	
	for(int x=0;x<q;x++){
		cin >> st.first >> st.second >> ed.first >> ed.second;
		
		if(st.first==ed.first&&st.second<=ed.second){
			cout << "Yes\n";
			continue;
		}
		else if(st.first>ed.first){
			cout << "No\n";
			continue;
		}
		
		//go to nearest green
		int index=lower_bound(mp[st.first].begin(),mp[st.first].end(),st.second)-mp[st.first].begin();
		if(index>=(int)mp[st.first].size()){
			cout << "No\n";
			continue;
		}
		int take=mp2[{st.first,mp[st.first][index]}];
		
		for(int y=19;y>=0;y--){
			if(hash[two[y][take]].first<ed.first){
				take=two[y][take];
			}
		}
		
		if(hash[take].first+1==ed.first&&hash[take].second<=ed.second){
			cout << "Yes\n";
		}
		else cout << "No\n";
	}
	
	
	
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//cin >> t;
	//freopen("in.txt","w",stdout);
	while(t--){
		solve();
	}
}

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