oj.uz

Submission #223398

# Submission time Handle Problem Language Result Execution time Memory
223398 2020-04-15T08:44:37 Z errorgorn Matching (COCI20_matching) C++14
58 / 110
 2500 ms 14008 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<ll,ll>
#define iii pair<ll,ii>
#define endl '\n'
 
const int MOD=1000000007;
 
int n;
 
ii pos[100005];
vector<int> X[100005];
vector<int> Y[100005];
 
bool visited[100005];
 
deque<int> stk; //bruh
 
void dfs(int i,bool dir){
	//cout<<i<<" "<<dir<<endl;
	visited[i]=true;
	
	if (dir) stk.push_back(i);
	else stk.push_front(i);
	
	for (auto &it:X[pos[i].first]) if (!visited[it]) dfs(it,dir);
	for (auto &it:Y[pos[i].second]) if (!visited[it]) dfs(it,dir);
}

struct comp{
	vector<ii> ansX;
	vector<ii> ansY;
	
	comp(){}
};

vector<comp> comps; //this is so cancer bruh

vector<int> mono;

vector<ii> ans; //real answer now

bool intersect(ii i,ii j){
	if (pos[i.first].first!=pos[i.second].first) swap(i,j);
	if (pos[i.first].second==pos[i.second].second || pos[j.first].first==pos[j.second].first) return false;
	//cout<<i.first<<" "<<i.second<<" "<<j.first<<" "<<j.second<<endl;
	return min(pos[j.first].first,pos[j.second].first)<=pos[i.first].first &&
			max(pos[j.first].first,pos[j.second].first)>=pos[i.first].first &&
			min(pos[i.first].second,pos[i.second].second)<=pos[j.first].second &&
			max(pos[i.first].second,pos[i.second].second)>=pos[j.first].second;
}
 
int main(){	
	ios::sync_with_stdio(0);
	cin.tie(0);
	
	cin>>n;
	
	int a,b;
	int index=0;
	for (int x=0;x<n;x++){
		cin>>a>>b;
		
		pos[index]=ii(a,b);
		X[a].push_back(index);
		Y[b].push_back(index);
		
		index++;
	}
	
	for (int x=0;x<n;x++){
		if (!visited[x]){
			visited[x]=true;
			stk.clear();
			stk.push_back(x);
			
			for (auto &it:X[pos[x].first]) if (!visited[it]) dfs(it,true);
			for (auto &it:Y[pos[x].second]) if (!visited[it]) dfs(it,false);
			
			if (stk.size()%2==1){
				cout<<"NE"<<endl;
				return 0;
			}
			else{
				comps.push_back(comp());
				if (pos[stk[0]].first==pos[stk[1]].first){
					for (int x=0;x<stk.size();x+=2){
						comps.back().ansX.push_back(ii(stk[x],stk[x+1]));
					}
					if (pos[stk.front()].second==pos[stk.back()].second){
						stk.push_back(stk.front());
						stk.pop_front();
						
						for (int x=0;x<stk.size();x+=2){
							comps.back().ansY.push_back(ii(stk[x],stk[x+1]));
						}
					}
				}
				else{
					for (int x=0;x<stk.size();x+=2){
						comps.back().ansY.push_back(ii(stk[x],stk[x+1]));
					}
					if (pos[stk.front()].first==pos[stk.back()].first){
						stk.push_back(stk.front());
						stk.pop_front();
						
						for (int x=0;x<stk.size();x+=2){
							comps.back().ansX.push_back(ii(stk[x],stk[x+1]));
						}
					}
				}
			}
		}
	}
	
	/*
	for (auto &it:comps){
		cout<<it.ansX.size()<<" "<<it.ansY.size()<<endl;
	}
	*/
	
	for (int x=0;x<comps.size();x++) {
		if (comps[x].ansX.empty() || comps[x].ansY.empty()) mono.push_back(x);
	}
	
	while (!mono.empty()){
		int index=mono.back();
		mono.pop_back();
		
		for (int x=0;x<comps.size();x++){
			if (!(comps[x].ansX.empty() || comps[x].ansY.empty())){
				if (comps[index].ansX.empty()){
					for (auto &it:comps[index].ansY){
						for (auto &it2:comps[x].ansX){
							if (intersect(it,it2)){
								comps[x].ansX.clear();
								mono.push_back(x);
								goto _end;
							}
						}
					}
				}
				else{
					for (auto &it:comps[index].ansX){
						for (auto &it2:comps[x].ansY){
							if (intersect(it,it2)){
								comps[x].ansY.clear();
								mono.push_back(x);
								goto _end;
							}
						}
					}
				}
				
				_end:;
			}
		}
	}
	
	for (auto &it:comps){
		if (it.ansX.empty()) ans.insert(ans.end(),it.ansY.begin(),it.ansY.end());
		else ans.insert(ans.end(),it.ansX.begin(),it.ansX.end());
	}
	
	for (int x=0;x<ans.size();x++){
		for (int y=0;y<ans.size();y++){
			if (intersect(ans[x],ans[y])){
				cout<<"NE"<<endl;
				return 0;
			}
		}
	}
	
	cout<<"DA"<<endl;
	for (auto &it:ans){
		cout<<it.first+1<<" "<<it.second+1<<endl;
	}
}

Compilation message

matching.cpp: In function 'int main()':
matching.cpp:88:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (int x=0;x<stk.size();x+=2){
                   ~^~~~~~~~~~~
matching.cpp:95:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int x=0;x<stk.size();x+=2){
                    ~^~~~~~~~~~~
matching.cpp:101:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (int x=0;x<stk.size();x+=2){
                   ~^~~~~~~~~~~
matching.cpp:108:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for (int x=0;x<stk.size();x+=2){
                    ~^~~~~~~~~~~
matching.cpp:123:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int x=0;x<comps.size();x++) {
               ~^~~~~~~~~~~~~
matching.cpp:131:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int x=0;x<comps.size();x++){
                ~^~~~~~~~~~~~~
matching.cpp:166:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int x=0;x<ans.size();x++){
               ~^~~~~~~~~~~
matching.cpp:167:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int y=0;y<ans.size();y++){
                ~^~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 10 ms 4992 KB Output is correct

Subtask #2
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 10 ms 4992 KB Output is correct
3 Correct 8 ms 4992 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 7 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct

Subtask #3
7.0 / 7.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 10 ms 4992 KB Output is correct
3 Correct 8 ms 4992 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 7 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 8 ms 4992 KB Output is correct
10 Correct 7 ms 4992 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 4992 KB Output is correct

Subtask #4
40.0 / 40.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 10 ms 4992 KB Output is correct
3 Correct 8 ms 4992 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 7 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 8 ms 4992 KB Output is correct
10 Correct 7 ms 4992 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 4992 KB Output is correct
13 Correct 15 ms 5248 KB Output is correct
14 Correct 16 ms 5376 KB Output is correct
15 Correct 17 ms 5376 KB Output is correct
16 Correct 16 ms 5248 KB Output is correct
17 Correct 18 ms 5248 KB Output is correct
18 Correct 15 ms 5248 KB Output is correct
19 Correct 15 ms 5376 KB Output is correct
20 Correct 13 ms 5376 KB Output is correct
21 Correct 13 ms 5248 KB Output is correct
22 Correct 8 ms 5248 KB Output is correct
23 Correct 15 ms 5248 KB Output is correct
24 Correct 12 ms 5248 KB Output is correct

Subtask #5
0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 4992 KB Output is correct
2 Correct 10 ms 4992 KB Output is correct
3 Correct 8 ms 4992 KB Output is correct
4 Correct 7 ms 5120 KB Output is correct
5 Correct 7 ms 4992 KB Output is correct
6 Correct 7 ms 5120 KB Output is correct
7 Correct 7 ms 4992 KB Output is correct
8 Correct 7 ms 4992 KB Output is correct
9 Correct 8 ms 4992 KB Output is correct
10 Correct 7 ms 4992 KB Output is correct
11 Correct 7 ms 4992 KB Output is correct
12 Correct 7 ms 4992 KB Output is correct
13 Correct 15 ms 5248 KB Output is correct
14 Correct 16 ms 5376 KB Output is correct
15 Correct 17 ms 5376 KB Output is correct
16 Correct 16 ms 5248 KB Output is correct
17 Correct 18 ms 5248 KB Output is correct
18 Correct 15 ms 5248 KB Output is correct
19 Correct 15 ms 5376 KB Output is correct
20 Correct 13 ms 5376 KB Output is correct
21 Correct 13 ms 5248 KB Output is correct
22 Correct 8 ms 5248 KB Output is correct
23 Correct 15 ms 5248 KB Output is correct
24 Correct 12 ms 5248 KB Output is correct
25 Execution timed out 2585 ms 14008 KB Time limit exceeded
26 Halted 0 ms 0 KB -