oj.uz

Submission #750421

# Submission time Handle Problem Language Result Execution time Memory
750421 2023-05-29T13:40:45 Z vjudge1 Event Hopping (BOI22_events) C++17
10 / 100
 181 ms 19356 KB 
#include<bits/stdc++.h>
using namespace std;
int sz=0;

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	//cout.tie(0);
	int n,m;
	cin>>n>>m;
	vector<int>allind;
	vector<pair<int,int>>all(n);
	for(int i=0;i<n;i++){
		cin>>all[i].first>>all[i].second;
		allind.push_back(all[i].first);
		allind.push_back(all[i].second);
	}
	sort(allind.begin(),allind.end());
	allind.resize(unique(allind.begin(),allind.end())-allind.begin());
	sz=(int)allind.size();
	vector<vector<pair<int,pair<int,int>>>>quer(sz+10);
	vector<vector<int>>addy(sz+1);
	for(int i=0;i<n;i++){
		int p=lower_bound(allind.begin(),allind.end(),all[i].second)-allind.begin();
		int pp=lower_bound(allind.begin(),allind.end(),all[i].first)-allind.begin();
		addy[p].push_back(pp);
	}
	vector<int>res(m+10);
	for(int i=0;i<m;i++){
		int l,r;
		cin>>l>>r;
		l--;
		r--;
		int ppp=lower_bound(allind.begin(),allind.end(),all[r].first)-allind.begin();
		int p=lower_bound(allind.begin(),allind.end(),all[r].second)-allind.begin();
		int pp=lower_bound(allind.begin(),allind.end(),all[l].second)-allind.begin();
		quer[p].push_back(make_pair(pp,make_pair(i,ppp)));	
		if(l==r){
			res[i]=2;
		}
	}
	vector<pair<int,int>>v;
	vector<int>vv;
	for(int i=0;i<sz;i++){
		for(auto x:addy[i]){
			while((int)v.size()>0&&v.back().first>=x){
				if((int)vv.size()>0&&vv.back()==v.size()){
					vv.pop_back();
				}
				v.pop_back();
			}
			while(v.size()>1&&v[(int)v.size()-2].second>=x){
				if((int)vv.size()>0&&vv.back()==v.size()){
					vv.pop_back();
				}
				v.pop_back();
			}
			if((int)v.size()!=0&&v.back().second==i){
				continue;
			}
			v.push_back(make_pair(x,i));
			if((int)v.size()==1||v[(int)v.size()-2].second<v.back().first){
				vv.push_back((int)v.size());
			}
		}
		//cout<<i<<" "<<allind[i]<<": \n";
		for(auto x:v){
			//cout<<x.first<<" "<<x.second<<"\n";
		}
		for(auto x:vv){
			//cout<<x<<"\n";
		}
		//cout<<"tamam\n";
		for(auto x:quer[i]){
			if(res[x.second.first]==2){
				res[x.second.first]=0;
				continue;
			}
			int z=lower_bound(v.begin(),v.end(),make_pair(x.first+1,-1))-v.begin();
			z--;
			if(x.first>i||((int)vv.size()>0&&vv.back()>z+1)){
				res[x.second.first]=-1;
				continue;
			}
			if(x.first<=i&&x.first>=x.second.second){
				res[x.second.first]=1;
				continue;
			}
			//cout<<i<<" "<<allind[i]<<" "<<vv.back()<<" "<<z<<"\n";
			res[x.second.first]=1+(int)v.size()-1-z;
			if(x.second.second!=v.back().first){
				if(z==(int)v.size()-1||v[(int)v.size()-2].second<x.second.second){
					res[x.second.first]++;
				}
			}
		}
	}
	for(int i=0;i<m;i++){
		if(res[i]==-1){
			cout<<"impossible\n";
		}
		else{
			cout<<res[i]<<"\n";
		}
	}
}

Compilation message

events.cpp: In function 'int main()':
events.cpp:47:35: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     if((int)vv.size()>0&&vv.back()==v.size()){
      |                          ~~~~~~~~~^~~~~~~~~~
events.cpp:53:35: warning: comparison of integer expressions of different signedness: '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |     if((int)vv.size()>0&&vv.back()==v.size()){
      |                          ~~~~~~~~~^~~~~~~~~~
events.cpp:67:12: warning: variable 'x' set but not used [-Wunused-but-set-variable]
   67 |   for(auto x:v){
      |            ^
events.cpp:70:12: warning: unused variable 'x' [-Wunused-variable]
   70 |   for(auto x:vv){
      |            ^

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 105 ms 13584 KB Output is correct
3 Correct 111 ms 13284 KB Output is correct
4 Correct 116 ms 13128 KB Output is correct
5 Correct 104 ms 13680 KB Output is correct
6 Correct 117 ms 14120 KB Output is correct
7 Correct 111 ms 14312 KB Output is correct
8 Correct 111 ms 19308 KB Output is correct
9 Correct 118 ms 19356 KB Output is correct
10 Correct 181 ms 14140 KB Output is correct
11 Correct 154 ms 16044 KB Output is correct
12 Correct 62 ms 11712 KB Output is correct

Subtask #2
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 380 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 1 ms 468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #3
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 380 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 1 ms 468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 380 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Incorrect 1 ms 468 KB Output isn't correct
8 Halted 0 ms 0 KB -

Subtask #5
0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 103 ms 13648 KB Output is correct
2 Correct 110 ms 13236 KB Output is correct
3 Correct 112 ms 13120 KB Output is correct
4 Correct 113 ms 19344 KB Output is correct
5 Correct 141 ms 14124 KB Output is correct
6 Incorrect 154 ms 17648 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 105 ms 13584 KB Output is correct
3 Correct 111 ms 13284 KB Output is correct
4 Correct 116 ms 13128 KB Output is correct
5 Correct 104 ms 13680 KB Output is correct
6 Correct 117 ms 14120 KB Output is correct
7 Correct 111 ms 14312 KB Output is correct
8 Correct 111 ms 19308 KB Output is correct
9 Correct 118 ms 19356 KB Output is correct
10 Correct 181 ms 14140 KB Output is correct
11 Correct 154 ms 16044 KB Output is correct
12 Correct 62 ms 11712 KB Output is correct
13 Correct 0 ms 212 KB Output is correct
14 Correct 0 ms 212 KB Output is correct
15 Correct 1 ms 380 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Incorrect 1 ms 468 KB Output isn't correct
20 Halted 0 ms 0 KB -