Submission #51689

#	Time	Username	Problem	Language	Result	Execution time	Memory
51689		zetapi	New Home (APIO18_new_home)	C++14	10 / 100	1204 ms	173236 KiB

new_home

#include <bits/stdc++.h>
using namespace std;
 
#define pb  push_back
#define mp  make_pair
#define int long long
#define itr ::iterator 
 
typedef pair<int,int>  pii;
 
const int MAX=5e5;
const int INF=1e8;
 
vector<int> fst_,sec_,vec[MAX];
vector<pii> fst,sec,increasing,decreasing;
 
int N,K,Q,X,Y,Z,l,r,pre,res,Begin,End;
 
bool cmp(pii X,pii Y)
{
	return X.first<Y.first;
}
 
signed main()
{
	ios_base::sync_with_stdio(false);
	/*cin.tie(0);
	cout.tie(0);*/
 
 	Begin=0;
 	End=INF;
	cin>>N>>K>>Q;
	for(int A=1;A<=N;A++)
	{
		cin>>X>>Y>>Z>>Z;
		vec[Y].pb(X);
	}
	for(int A=1;A<=K;A++)
	{
		if(vec[A].empty())
		{
			while(Q--)
				cout<<-1<<"\n";
			return 0;
		}
		sort(vec[A].begin(),vec[A].end());
		for(int B=1;B<vec[A].size();B++)
			increasing.pb(mp(vec[A][B-1],(vec[A][B-1]+vec[A][B])/2));
		for(int B=vec[A].size()-2;B>=0;B--)
			decreasing.pb(mp(vec[A][B+1],(vec[A][B+1]+vec[A][B]+1)/2));		
		increasing.pb(mp(vec[A].back(),INF));
		decreasing.pb(mp(*vec[A].begin(),0));
		Begin=max(Begin,*vec[A].begin());
		End=min(End,vec[A].back());
	}
	sort(increasing.begin(),increasing.end());
	sort(decreasing.begin(),decreasing.end());
	for(int A=0;A<increasing.size();A++)
	{
		l=max(pre+1,increasing[A].first);
		r=increasing[A].second;
		if(l>r)
			continue;
		fst.pb(mp(l,r));
		fst_.pb(increasing[A].first);
		pre=r;
	}
	pre=INF+99;
	for(int A=decreasing.size()-1;A>=0;A--)
	{
		l=min(pre-1,decreasing[A].first);
		r=decreasing[A].second;
		if(l<r)
			continue;
		sec.pb(mp(r,l));
		sec_.pb(decreasing[A].first);
		pre=r;
	}
	reverse(sec.begin(),sec.end());
	reverse(sec_.begin(),sec_.end());
	/*for(auto A:fst)
		cout<<A.first<<" fst "<<A.second<<"\n";
	for(auto A:sec)
		cout<<A.first<<" sec "<<A.second<<"\n";*/
	while(Q--)
	{
		res=0;
		cin>>X>>Y;
		/*if(X<Begin)
		{
			cout<<Begin-X<<"\n";
			continue;
		}
		else if(X>End)
		{
			cout<<X-End<<"\n";
			continue;
		}*/
		int low=0,high=fst.size()-1,mid;
		while(low<=high)
		{
			mid=(low+high)/2;
			if(fst[mid].first<=X and fst[mid].second>=X)
			{
				res=max(res,abs(X-fst_[mid]));
				break;
			}
			else if(fst[mid].second<X)
				low=mid+1;
			else if(fst[mid].first>X)
				high=mid-1;
		}
		low=0,high=sec.size()-1;
		while(low<=high)
		{
			mid=(low+high)/2;
			if(sec[mid].first<=X and sec[mid].second>=X)
			{
				res=max(res,abs(sec_[mid]-X));
				break;
			}
			else if(sec[mid].second<X)
				low=mid+1;
			else if(sec[mid].first>X)
				high=mid-1;
		}
		cout<<res<<"\n";
	}
	return 0;
}

Compilation message (stderr)

new_home.cpp: In function 'int main()':
new_home.cpp:47:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int B=1;B<vec[A].size();B++)
               ~^~~~~~~~~~~~~~
new_home.cpp:58:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int A=0;A<increasing.size();A++)
              ~^~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 10 / 10
• Subtask 4: 0 / 23
• Subtask 5: 0 / 35
• Subtask 6: 0 / 20