Submission #206779

#TimeUsernameProblemLanguageResultExecution timeMemory
206779TAISA_Unscrambling a Messy Bug (IOI16_messy)C++14
100 / 100
9 ms564 KiB
#include <bits/stdc++.h>
#define eb emplace_back
#include "messy.h"
using namespace std;
void write(int n,int l,int r,int f){
	string s(n,'0');
	if(l==0&&r==n){
		for(int i=0;i<n/2;i++){
			s[i]='1';
			add_element(s);
			s[i]='0';
		}
		write(n,0,n/2,1);
		write(n,n/2,n,0);
		return;
	}
	if(r-l==1)return;
	if(f){
		for(int i=r;i<r+r-l;i++){
			s[i]='1';
		}
	}else{
		for(int i=l-(r-l);i<l;i++){
			s[i]='1';
		}
	}
	int m=(l+r)/2;
	for(int i=l;i<m;i++){
		s[i]='1';
		add_element(s);
		s[i]='0';
	}
	write(n,l,m,1);
	write(n,m,r,0);
}
std::vector<int> restore_permutation(int n, int w, int r) {
	write(n,0,n,1);
	compile_set();
	vector<vector<int>> vs(2*n);
	string s(n,'0');
	for(int i=0;i<n;i++){
		s[i]='1';
		if(check_element(s)){
			vs[2].eb(i);
		}else{
			vs[3].eb(i);
		}
		s[i]='0';
	}
	for(int i=2;i<n;i++){
		int p=((i>>1)<<1);
		if((i&1)==0){
			p|=1;
		}
		s=string(n,'0');
		for(auto &e:vs[p]){
			s[e]='1';
		} 
		for(auto &e:vs[i]){
			s[e]='1';
			if(check_element(s)){
				vs[i<<1].eb(e);
			}else{
				vs[i<<1|1].eb(e);
			}
			s[e]='0';
		}
	}
	vector<int> p(n);
	for(int i=0;i<n;i++){
		p[vs[i+n][0]]=i;
	}
	return p;
}
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