oj.uz

Submission #906095

# Submission time Handle Problem Language Result Execution time Memory
906095 2024-01-13T13:44:56 Z sunwukong123 Joker (BOI20_joker) C++14
0 / 100
 2000 ms 42688 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long 
#ifdef LOCAL
void debug_out() {cerr<<endl;}
template <typename Head, typename... Tail>
void debug_out(Head _H, Tail... _T) {cerr<<" "<<to_string(_H);debug_out(_T...);}
#define debug(...) cerr<<"["<<#__VA_ARGS__<<"]:",debug_out(__VA_ARGS__)
#else
#define debug(...)
#endif
const int MAXN = 200005;
const int inf=1000000500ll;
const long long oo =1000000000000000500ll;
const int MOD = (int)1e9 + 7;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
typedef pair<int,int> pi; 
int n,m,q;
pi A[MAXN];
struct ufds_{
	int p[MAXN],dist[MAXN];
	vector<array<int,4>>rollback;
	int TIME=0;
	bool nonbi=0;
	ufds_(){
		iota(p,p+MAXN,0);
	}
	
	pi find(int x){
		if(x==p[x])return {x,dist[x]};
		else{
			rollback.push_back({TIME,x,p[x],dist[x]});
			int cur=dist[x];
			pi np=find(p[x]);
			dist[x]^=np.second;
			p[x]=np.first;
			return {p[x],dist[x]};
		}
	}
	void merge(int x, int y){
		++TIME;

		int distx=dist[x];
		int disty=dist[y];
		if(find(x) == find(y)){
			if((dist[x] ^ dist[y]) == 0){
				rollback.push_back({TIME,-1,nonbi,nonbi});
				nonbi=1;
			} else {
				
			}
			return;
		}
		
		x=find(x).first;
		rollback.push_back({TIME,x,p[x],dist[x]});
		dist[x]=distx^disty^1;
		p[x]=find(y).first;
		
	}
	void rb(int dt){
		int tt=TIME-dt;
		while(rollback.size() && rollback.back()[0]>tt){

			array<int,4>cur=rollback.back();rollback.pop_back();
			if(cur[1] == -1){
				nonbi=cur[2];
			} else{
				p[cur[1]]=cur[2];
				dist[cur[1]]=cur[3];
			}
			
		}
		TIME-=dt;
	}
}ufds;
int ans[MAXN];
void dnc(int s, int e, int l, int r){
	if(s>e)return;
	int m=(s+e)/2;
	for(int i=s;i<=m;i++){
		ufds.merge(A[i].first,A[i].second);
	}

	for(int i=r;i>=l;i--){

		ufds.merge(A[i].first,A[i].second);
		if(ufds.nonbi){
			ans[m]=i;
			break;
		}
	}
	
	ufds.rb(r-ans[m]+1);
	if(s!=e){
		dnc(m+1,e,ans[m],r);
	}
	
	ufds.rb(m-s+1);
	if(s!=e){
		for(int i=r;i>=ans[m];i--){
			ufds.merge(A[i].first,A[i].second);
		}
		dnc(s,m-1,l,ans[m]);
		ufds.rb(r-ans[m]+1);
	}
	
}

int32_t main() 
{
	ios_base::sync_with_stdio(0); cin.tie(0);
	cin>>n>>m>>q;
	//check if whole graph is bipartite
	A[0].first=0;
	A[0].second=1;
	A[m+1].first=0;
	A[m+1].second=1;
	for(int i=1;i<=m;i++)cin>>A[i].first>>A[i].second;
	dnc(0,m+1,0,m+1);

	while(q--){
		int l,r;cin>>l>>r;
		if(ans[l-1]>r)cout<<"YES\n";
		else cout<<"NO\n";
	}
}

Compilation message

Joker.cpp: In member function 'pi ufds_::find(long long int)':
Joker.cpp:33:8: warning: unused variable 'cur' [-Wunused-variable]
   33 |    int cur=dist[x];
      |        ^~~

Subtask #1
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Incorrect 2 ms 6492 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Incorrect 2 ms 6492 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Execution timed out 2025 ms 42688 KB Time limit exceeded
4 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Incorrect 2 ms 6492 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Incorrect 2 ms 6492 KB Output isn't correct
7 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 6488 KB Output is correct
2 Correct 2 ms 6492 KB Output is correct
3 Correct 1 ms 6492 KB Output is correct
4 Correct 1 ms 6492 KB Output is correct
5 Correct 1 ms 6492 KB Output is correct
6 Incorrect 2 ms 6492 KB Output isn't correct
7 Halted 0 ms 0 KB -