Submission #995381

#	Time	Username	Problem	Language	Result	Execution time	Memory
995381		Bors	Data Transfer (IOI19_transfer)	C++17	0 / 100	5 ms	2512 KiB

transfer

#include <bits/stdc++.h>
using namespace std;
#define repf(i,k,n) for(int i=k; i<n; i++)
#define rep(i,n) for(int i=0; i<n; i++)
#define all(v) v.begin(), v.end()

typedef vector<int> vi;

vi get_attachment(vi source){
	int n=source.size(),k=(n>200 ? 8:6);

	vi v(k,0);
	rep(i,n){
		rep(j,k) if((i+1)&(1<<j)) v[j]^=source[i];
	}

	int x=0;
	rep(i,n) x^=source[i];
	v.push_back(x);
	return v;
}

vi retrieve(vi data){
	//cerr<<"\n===\n";
	int n=(data.size()>200 ? 255:63),
		k=(n==255?8:6);

	vi v(k,0);
	rep(i,n){
		rep(j,k) if((i+1)&(1<<j)) v[j]^=data[i];
	}
	vi w(k); rep(i,k) w[i]=data[i+n];

	if(v==w) cerr<<"sol1\n";
	if(v==w) return vi(data.begin(),data.begin()+n);


	int x=0;
	rep(i,k) x^=v[i];

	int cnt=0; rep(i,k) cnt+=v[i]^w[i];
	//rep(i,k) cerr<<w[i]<<' '; cerr<<' '<<data.back()<<'\n';
	//rep(i,k) cerr<<v[i]<<' '; cerr<<' '<<x<<'\n';
	

	//if(cnt==1 and x!=data.back()) cerr<<"sol2\n";
	if(cnt==1 and x!=data.back()) return vi(data.begin(),data.begin()+n);
	


	x=0;
	rep(i,k){
		if(v[i]^w[i]) x^=(1<<i); 
	}
	x--;
	//cerr<<"flipped: " << x << '\n';
	data[x]^=1;

	//cerr<<"sol3\n";
	return vi(data.begin(),data.begin()+n);
}

• Subtask 1: 0 / 60
• Subtask 2: 0 / 40