Submission #713861

#	Time	Username	Problem	Language	Result	Execution time	Memory
713861		chenyan	Data Transfer (IOI19_transfer)	C++17	80 / 100	60 ms	2548 KiB

transfer

#include<bits/stdc++.h>
using namespace std;
#define pb push_back
/*
vector<int> get_attachment(vector<int>a){
	int i,v=0;
	for(int u:a)v^=u;	
	a.pb(v);
	return a;
}
vector<int>retrieve(vector<int>a){
	int k=a.back(),v=0,u=0,i;
	a.pop_back();
	for(i=0;i<a.size()/2;i++){
		v^=a[i];
		u^=a[i+a.size()/2];
	}
	if(v==u){
		a.resize(a.size()/2);
		return a;
	}
	vector<int>ans;
	for(i=0;i<a.size()/2;i++){
		ans.pb(a[i+(v==k?0:(int)a.size()/2)]);
	}
	return ans;
}
*/
vector<int> get_attachment(vector<int> a){
	int v=0,i,n=a.size(),cnt=0;
	for(i=1;i<=n;i++)if(a[i-1])v^=i,cnt++;
	vector<int>r;
	for(i=(n<=63?6:8);i>=0;i--) r.pb((v>>i)&1);
	r.pb(cnt&1);
	return r;
}
vector<int>retrieve(vector<int> a){
	int i,j,n=a.size(),k,v=0,u=0,cnt=0;
	if(n<=71)n-=8,k=8;
	else n=255,k=10;
	for(i=1;i<=n;i++){
		if(a[i-1])v^=i,cnt++;
	}
	for(i=0;i<k-1;i++){
		u+=(a[i+n]<<(k-2-i));
	}
	if(u==v||(cnt&1)==a[n+k-1]){
		a.resize(n);
		return a;
	}
	a[(u^v)-1]^=1;
	a.resize(n);
	return a;
}
/*
int main(){
	int n;
	cin>>n;
	vector<int>v(n);
	for(int i=0;i<n;i++)cin>>v[i];
	vector<int>u=get_attachment(v);
	for(int k:u)cout<<k<<' ';
	cout<<'\n';
	int k;
	cin>>k;
	u[k]^=1;
	for(int u:retrieve(u))
		cout<<u<<' ';
}
*/

Compilation message (stderr)

transfer.cpp: In function 'std::vector<int> retrieve(std::vector<int>)':
transfer.cpp:38:8: warning: unused variable 'j' [-Wunused-variable]
   38 |  int i,j,n=a.size(),k,v=0,u=0,cnt=0;
      |        ^

• Subtask 1: 48 / 60
• Subtask 2: 32 / 40