Codeforces Round #671 (Div. 2)

Codeforces Round #671 (Div. 2)

Codeforces Round #671 (Div. 2)

A

int main(){
	int t=read();
	while(t--){
		int n;
		cin>>n;
		string s;
		cin>>s;
		int e1=0,o1=0,e2=0,o2=0;
		int focus=0;
		if(s.size()%2==1){
			focus=1;
		}
		else focus=2;
		for(int i=s.size()-1,t=n;i>=0;i--,t--){
			int type=0;
			if((s[i]-'0')%2==0){
				type=2;
			}
			else type=1;
			if(type==1){
				if(t%2==1) o1++;
				else o2++;
			}
			else{
				if(t%2==1) e1++;
				else e2++;
			}
		}
		if(focus==1){
			if(o1>0){
				cout<<"1\n";
			}
			else{
				cout<<"2\n";
			}
		}
		else{
			if(e2>0){
				cout<<"2\n";
			}
			else{
				cout<<"1\n";
			}
		}
	}
	return 0;
}

B

int main(){
	int t=read();
	while(t--){
		ll k=read();
		int cnt=0;
		ll now=0;
		ll p=1;
		while(k>=now*2+p*p){
			k-=now*2+p*p;
			now=now*2+p*p;
			p*=2;
			cnt++;
		//	cout<<now<<'\n';	
		}
		cout<<cnt<<'\n';
	}
	return 0;
}

C

int vn[1001];
int main(){
	int t=read();
	while(t--){
		int n=read(),q=read();
		int ans=0,cnt=0;
		bool ch=true;
		for(int i=1;i<=n;++i){
			vn[i]=read();
			int diff=vn[i]-q;
			if(diff!=0)ch=false,cnt++;
			ans+=diff;
		}	
		if(ch==true){
			 cout<<'0'<<'\n';
		}
		else if(ans==0||cnt<n){
			 cout<<'1'<<'\n';
		}
		else{
			 cout<<'2'<<'\n';
		}
	}
	
	return 0;
}

D

int main(){
	int n=read();
	vector<int>np(n);
	for(int i=0;i<n;++i)np[i]=read();
	sort(np.begin(),np.end(),greater<int>());
	vector<int>ans;
	vector<int>ps;
	int pt1=0,pt2=ceil(n/2.0);
	for(int i=0;i<n;++i){
		if(i%2==0)
		ans.push_back(np[pt1++]);
		else{
			if(pt2<n&&np[pt2]<ans.back()){
				ans.push_back(np[pt2++]);
			}
			else{
				bool ms=false;
				while(pt2<n&&np[pt2]>=ans.back()){
					ps.push_back(np[pt2++]);
				}
				if(pt2<n&&np[pt2]<ans.back()){
					ans.push_back(np[pt2++]);
				}
				else{
					ans.push_back(ps.back());
					ps.pop_back();
				}
			}
			
		}
		
	}
	int cnt=0;
	for(int i=0;i<n;++i){
		if(i-1>=0&&i+1<n){
			if(ans[i]<ans[i-1]&&ans[i]<ans[i+1])
			cnt++;
		}
	}
	cout<<cnt<<'\n';
	for(int i=0;i<n;++i)
	cout<<ans[i]<<' ';
	return 0;
}

E

vector<int>ans;
vector<int>primelist;
vector<int>primecnt;
int main(){
	int t=read();
	while(t--){
		ans.clear();
		primecnt.clear();
		primelist.clear();
		int n=read();
		bool isp=true;
		for(ll i=2;i*i<=n;++i){
			if(n%i==0){
				isp=false;
				primelist.push_back(i);
				primecnt.push_back(1);
				n/=i;
				while(n%i==0){
					n/=i;
					++primecnt.back();
				}
			}
		}
		if(isp==true){
			cout<<n<<'\n';
			cout<<0<<'\n';
			continue;
		}
		if(n!=1){
//			cout<<"Yes:\n";
			primelist.push_back(n);
			primecnt.push_back(1);
		}
		int cnt=0;
		vector<int>pre;
		pre.push_back(1);
		for(int i=0;i<primelist.size();++i){
			vector<int>ist;
			int now=1;
			for(int j=1;j<=primecnt[i];++j){
				now*=primelist[i];
				for(int k=0;k<pre.size();++k){
					ist.push_back(now*pre[k]);
				}
			}
			if(i+1<primelist.size())
				for(int u=ist.size()-1;u>=0;--u)
				ans.push_back(ist[u]); 
			else{
				if(ist.size()!=2)
				ans.push_back(ist.back()); 
				for(int u=ist.size()-2;u>=0;--u)
				if(u!=1)ans.push_back(ist[u]);
				if(ist.size()>1)
				ans.push_back(ist[1]);
			}
			for(int u:ist)
			pre.push_back(u);
		}
		for(int i=0;i<ans.size();++i){
			cout<<ans[i]<<' ';
			if(__gcd(ans[i],ans[(i+1<ans.size()?i+1:0)])==1){
				//cout<<ans[i]*ans[(i+1<ans.size()?i+1:0)]<<' ';
				cnt++;
			}
		}
		cout<<'\n';
		cout<<cnt<<'\n';
//		cout<<"end\n";
	}
	return 0;
}