oj.uz

답안 #962039

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
962039 2024-04-13T05:36:56 Z pcc Joker (BOI20_joker) C++17
0 / 100
 8 ms 17244 KB 
#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pll pair<ll,ll>
#define pii pair<int,int>
#define fs first
#define sc second
#define tlll tuple<ll,ll,ll>
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,popcnt,sse4")

const int mxn = 4e5+30;
int N,M,Q;

struct DSU{
	vector<pii> sop,dop;
	vector<int> cop;
	bool cyc;
	int dsu[mxn],sz[mxn];
	void init(int n){
		cyc = false;
		for(int i = 0;i<=n;i++)dsu[i] = i,sz[i] = 1;
	}
	int root(int k){
		return k == dsu[k]?k:root(dsu[k]);
	}
	void onion(int a,int b){
		 a = root(a),b = root(b);
		 if(a == b){
			 sop.push_back(pii(0,0));
			 dop.push_back(pii(0,0));
			 return;
		 }
		 if(sz[a]<sz[b])swap(a,b);
		 sop.push_back(pii(a,sz[a]));
		 dop.push_back(pii(b,b));
		 dsu[b] = a;
		 sz[a] += sz[b];
		 return;
	}
	void roll(){
		for(int i = 0;i<2;i++){
		{
			auto [a,b] = sop.back();sop.pop_back();
			sz[a] = b;
		}{
			auto [a,b] = dop.back();dop.pop_back();
			dsu[a] = b;
		}{
			auto a = cop.back();cop.pop_back();
			cyc = a;
		}}
		return;
	}
	void add_edge(int a,int b){
		onion(a,b+N);
		onion(b,a+N);
		cop.push_back(cyc);
		if(root(a) == root(a+N))cyc = true;
		cop.push_back(cyc);
		if(root(b) == root(b+N))cyc = true;
		assert(cop.size() == dop.size());
		return;
	}
};

DSU dsu;
pii edges[mxn];
pii req[mxn];
int rp[mxn];

void dc(int l,int r,int sl,int sr){
	//cerr<<l<<' '<<r<<':'<<sl<<' '<<sr<<endl;
	if(l == r){
		for(int i = sl;i<=sr;i++){
			rp[i] = l;
		}
		return;
	}
	int mid = (l+r)>>1;
	bool f = false;
	for(int i = r;i>mid;i--){
		auto [a,b] = edges[i];
		dsu.add_edge(a,b);
	}
	//cerr<<l<<' '<<mid<<' '<<r<<":"<<sl<<' '<<sr<<','<<dsu.cyc<<endl;
	//for(int i = 1;i<=N;i++)cerr<<dsu.root(i)<<' ';cerr<<endl;
	if(dsu.cyc){
		for(int i = r;i>mid;i--){
			dsu.roll();
		}
		dc(mid+1,r,sl,sr);
		return;
	}
	int opt = sl;
	for(int i = sl;i<=sr;i++){
		auto [a,b] = edges[i];
		dsu.add_edge(a,b);
		opt = i;
		if(dsu.cyc)break;
	}
	for(int i = sl;i<=opt;i++){
		dsu.roll();
	}
	if(sl != opt)dc(l,mid,sl,opt-1);
	for(int i = r;i>mid;i--){
		dsu.roll();
	}
	for(int i = sl;i<opt;i++){
		auto [a,b] = edges[i];
		dsu.add_edge(a,b);
	}
	dc(mid+1,r,opt,sr);
	for(int i = sl;i<opt;i++){
		dsu.roll();
	}
	return;
}

int ans[2020][2020];

int main(){
	ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
	cin>>N>>M>>Q;
	for(int i = 1;i<=M;i++)cin>>edges[i].fs>>edges[i].sc;
	for(int i = 1;i<=Q;i++)cin>>req[i].fs>>req[i].sc;
	edges[M+2] = edges[0] = edges[M+1] = pii(N+1,N+2);
	N += 2;
	dsu.init(N*2+10);

	for(int i = 0;i<=M;i++){
		dsu.add_edge(edges[i].fs,edges[i].sc);
		for(int j = M+1;j>i;j--){
			dsu.add_edge(edges[j].fs,edges[j].sc);
			ans[i][j] = dsu.cyc;
			cerr<<i<<' '<<j<<":";
			for(int k = 0;k<=N;k++)cerr<<dsu.root(k)<<' ';cerr<<endl;
		}
		for(int j = N+1;j>i;j--)dsu.roll();
	}
	for(int i = 1;i<=Q;i++){
		auto [a,b] = req[i];
		if(ans[a-1][b+1])cout<<"YES\n";
		else cout<<"NO\n";
	}
	return 0;

	dc(0,M+1,0,M);
	//for(int i = 0;i<=M;i++)cerr<<rp[i]<<' ';cerr<<endl;
	for(int i = 1;i<=Q;i++){
		auto [s,e] = req[i];
		if(rp[s-1]>=e+1)cout<<"YES\n";
		else cout<<"NO\n";
	}
	return 0;
}

Compilation message

Joker.cpp: In function 'void dc(int, int, int, int)':
Joker.cpp:82:7: warning: unused variable 'f' [-Wunused-variable]
   82 |  bool f = false;
      |       ^
Joker.cpp: In function 'int main()':
Joker.cpp:138:4: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  138 |    for(int k = 0;k<=N;k++)cerr<<dsu.root(k)<<' ';cerr<<endl;
      |    ^~~
Joker.cpp:138:50: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  138 |    for(int k = 0;k<=N;k++)cerr<<dsu.root(k)<<' ';cerr<<endl;
      |                                                  ^~~~

Subtask #1
0 / 6.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #2
0 / 8.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #3
0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #4
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #5
0 / 22.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -

Subtask #6
0 / 29.0

# 결과 실행 시간 메모리 Grader output
1 Runtime error 8 ms 17244 KB Execution killed with signal 6
2 Halted 0 ms 0 KB -