Submission #514672

#	Time	Username	Problem	Language	Result	Execution time	Memory
514672		bebecanvas	Trampoline (info1cup20_trampoline)	C++14	0 / 100	2086 ms	165792 KiB

trampoline

#include <bits/stdc++.h>

using namespace std;
#define int long long
#define endl '\n'

int p[200005][18];
vector<int> V[200005];

void dfs(int x,int par){
	p[x][0]=par; 
	for(int k=1;k < 18;++k){
		int half_parent = p[x][k-1];
		if(half_parent == -1)continue; 
		p[x][k] = p[half_parent][k-1];
	}
	for(auto v:V[x]){
		if(v==par)continue; 
		dfs(v,x); 
	}
}

int query_parent(int x,int h){
	for (int k=0;k<18;++k){
		if( ((1<<k) & h) == 0)continue; // We only do this if the bit in h is on
		x = p[x][k]; // travel up to parent
		if (x == -1)return -1; // h-th parent does not exist
	}
	return x;
}

signed main(){
 
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    
    int r, c, n; cin >> r >> c >> n;
	set<pair<pair<int, int>, int> > green;
	set<pair<pair<int, int>, int> , greater<pair<pair<int, int>, int> > > greenn;
	map<int, pair<int, int> > m;
    for(int i=0; i<n; i++){
		int a, b; cin >> a >> b;
		green.insert(make_pair(make_pair(a, b), i));
		greenn.insert(make_pair(make_pair(a, b), i));
		m[i]= make_pair(a, b);
	}
	
	set<pair<pair<int, int>, int> > ::iterator it;
	for(it= green.begin(); it!=green.end(); it++){
		int a= it->first.first;
		int b= it->first.second;
		int c= it->second;
		set<pair<pair<int, int>, int> > ::iterator itt;
		for(itt= green.lower_bound(make_pair(make_pair(a+1, b), -1)); itt!=green.end(); itt++){
			int d= itt->first.first;
			//int e= itt->first.second;
			int f= itt->second;
			if(d!=a+1){break;}
			V[c].push_back(f);
		}
	}
	
	dfs(green.begin()->first.first, -1);
	
	int q; cin >> q;
	for(int i=0; i<q; i++){
		int a, b, c, d; cin >> a >> b >> c >> d;
		int e= c-a;
		if(e==0){
			if(b<d){cout << "Yes" << endl; continue;}
			else{cout << "No" << endl; continue;}
		}
		set<pair<pair<int, int>, int> > ::iterator itit= greenn.lower_bound(make_pair(make_pair(c-1, d), 300000));
		int f= itit->first.first;
		//cout << "f " << f <<  endl;
		if(f!=c-1){cout << "No" << endl; continue;}
		if(e==1){
			if(itit->first.second>=b){cout << "Yes" << endl; continue;}
			else{cout << "No" << endl; continue;}
		}
		int g= query_parent(itit->second, e-1);
		//cout << "g " << g << endl;
		if(g==-1){cout << "No" << endl; continue;}
		pair<int, int> temp= m[g];
		//cout << "temp.second " <<  temp.second << endl;
		if(temp.second>=b){cout << "Yes" << endl; continue;}
		else{cout << "No" << endl; continue;}
		
	}

 
}

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