Submission #388826

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
388826	2021-04-13T05:47:03 Z	huangqr	Joker (BOI20_joker)	C++14	0 / 100	1 ms	332 KB

Joker

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef pair<ll,ll> pl;
typedef pair<ll,pl> ppl;
const ll lim=25+5;
ll par[lim],rnk[lim],rel[lim];
ll parcpy[lim],rnkcpy[lim];
//rnk[findset(x)]-rnk[x]

pl findset(ll par[],ll x){
	ll cur=0,og=x;
	while(x!=par[x]){
		if(rel[x])cur=1-cur;
		x=par[x];
	}
	par[og]=x;
	rel[og]=cur;
	return {x,cur};
}

void mergeset(ll par[],ll rnk[],ll x,ll y){
	pl px=findset(par,x),py=findset(par,y);
	x=px.first,y=py.first;
	if(x==y)return;
	if(rnk[x]>rnk[y])swap(x,y);
	if(rnk[x]==rnk[y])rnk[y]++;
	par[x]=y;
	rnk[y]++;
	rel[x]=(px.second==py.second);
	return;
}

int main(){
	ios_base::sync_with_stdio(0),cin.tie(NULL);
	ll n,m,q;
	cin>>n>>m>>q;
	for(int i=1;i<=n;i++)par[i]=i;
	vector<pl>v;
	vector<pl>qs[lim];
	for(int i=0;i<m;i++){
		ll a,b;
		cin>>a>>b;
		v.emplace_back(a,b);
	}	
	bool ans[lim],cfa=0;
	fill(ans,ans+lim,0);
	for(int i=0;i<q;i++){
		ll a,b;
		cin>>a>>b;
		b--,b++;//b is the minimum index that can be used on the right side
		qs[b].emplace_back(a,i);
	}
	for(auto x:qs[m])ans[x.second]=cfa;//,cout<<"proced0:"<<x.second<<"\n";
	for(int i=m-1;i>=1;i--){
		sort(qs[i].begin(),qs[i].end());
		pl x=findset(par,v[i].first),y=findset(par,v[i].second);
		if(x.first==y.first){
			if(x.second==y.second){
				cfa=1;
			}
		}
		else mergeset(par,rnk,v[i].first,v[i].second);
		pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
		if(qs[i].empty())continue;
		for(auto x:qs[i])ans[x.second]=cfa;//cout<<"proced:"<<x.second<<"\n";
	}
	for(int i=0;i<q;i++){
		if(ans[i])cout<<"YES\n";
		else cout<<"NO\n";
	}
	return 0;
}

Compilation message

Joker.cpp: In function 'int main()':
Joker.cpp:64:6: warning: variable 'resx' set but not used [-Wunused-but-set-variable]
   64 |   pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
      |      ^~~~
Joker.cpp:64:35: warning: variable 'resy' set but not used [-Wunused-but-set-variable]
   64 |   pl resx=findset(par,v[i].first),resy=findset(par,v[i].second);
      |                                   ^~~~

Subtask #1

0 / 6.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Incorrect	0 ms	204 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #2

0 / 8.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Incorrect	0 ms	204 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #3

0 / 25.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Runtime error	1 ms	332 KB	Execution killed with signal 11
4	Halted	0 ms	0 KB	-

Subtask #4

0 / 10.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Incorrect	0 ms	204 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #5

0 / 22.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Incorrect	0 ms	204 KB	Output isn't correct
4	Halted	0 ms	0 KB	-

Subtask #6

0 / 29.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	204 KB	Output is correct
2	Correct	1 ms	204 KB	Output is correct
3	Incorrect	0 ms	204 KB	Output isn't correct
4	Halted	0 ms	0 KB	-