Submission #796741

#	Time	Username	Problem	Language	Result	Execution time	Memory
796741		amirhoseinfar1385	Abracadabra (CEOI22_abracadabra)	C++17	40 / 100	311 ms	33504 KiB

Main

#include<bits/stdc++.h>
using namespace std;
const int maxn=200000+10;
int n,q;
int all[maxn],res[maxn],link[maxn];
set<int>st,salam;
void solve(int v){
	st.clear();
	st.insert(n+1);
	salam.clear();
	salam.insert(n+1);
	for(int i=1;i<=n;i++){
		link[all[i]]=i;
	}
	int now=n;
	int ted=n/2;
	for(int i=n;i>=1;i--){
		//<<i<<endl;
		auto x=*st.lower_bound(link[i]);
		auto y=*salam.upper_bound(link[i]);
		x=min(x,y);
		if(x==link[i])
		{
			continue;
		}
		int len=x-link[i];
		int z=0,ft=ted;
		if(ted>0){
			int f=min((len-1)/ted,v);
			z=len-f*ted;
			for(int j=link[i]+len-ted;j>link[i]+z-1;j-=ted){
				salam.insert(j);
			}
			v-=f;
			ted-=z;
		}
		else{
			z=len;
		}
		//cout<<len<<" "<<ted<<" "<<z<<" "<<i<<" "<<link[i]<<" "<<x<<"\n";
		//<<len<<" "<<ted<<" "<<z<<endl; 
		for(int j=z-1;j>=0;j--){
			//<<j<<" "<<link[i]<<" "<<all[link[i]+j]<<" "<<len<<" "<<now<<endl;
			res[now]=all[link[i]+j];
			st.insert(link[i]+j);
			now--;
			//<<"salam"<<endl;
		}
	}
}

int main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	//freopen("inp.txt","r",stdin);
	//freopen("out2.txt","w",stdout);
	cin>>n>>q;
	for(int i=1;i<=n;i++){
		cin>>all[i];
	}
	int u,v;
	cin>>v>>u;
	solve(v);
	int lastv=v;
	cout<<res[u]<<"\n";
	for(int i=1;i<q;i++){
		cin>>v>>u;
		if(lastv!=v){
			assert(0);
			solve(v);
			lastv=v;
		}
		cout<<res[u]<<"\n";
	}
}

Compilation message (stderr)

Main.cpp: In function 'void solve(int)':
Main.cpp:27:11: warning: unused variable 'ft' [-Wunused-variable]
   27 |   int z=0,ft=ted;
      |           ^~

• Subtask 1: 0 / 10
• Subtask 2: 40 / 40
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25