Submission #245439

#	Time	Username	Problem	Language	Result	Execution time	Memory
245439		TadijaSebez	Chameleon's Love (JOI20_chameleon)	C++14	44 / 100	37 ms	416 KiB

chameleon

#include "chameleon.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define pii pair<int,int>

void Solve(int n) {
	if(n<=50){
		vector<bool> was(n*2+1,false);
		vector<vector<int>> cand(n*2+1,vector<int>());
		set<pii> bad;
		for(int j=1;j<=n*2;j++){
			for(int i=1;i<=n*2;i++)if(i!=j){
				if(Query({j,i})==1)cand[j].pb(i);
			}
			assert(cand[j].size()==1||cand[j].size()==3);
			if(cand[j].size()==3){
				int A=Query({j,cand[j][0],cand[j][1]});
				int B=Query({j,cand[j][1],cand[j][2]});
				int C=Query({j,cand[j][2],cand[j][0]});
				if(A==1)bad.insert({j,cand[j][2]});
				if(B==1)bad.insert({j,cand[j][0]});
				if(C==1)bad.insert({j,cand[j][1]});
			}
		}
		for(int j=1;j<=n*2;j++){
			if(was[j])continue;
			for(int i:cand[j]){
				if(!bad.count({i,j})&&!bad.count({j,i})){
					Answer(i,j);
					was[i]=was[j]=true;
					break;
				}
			}
		}
	}else{
		vector<bool> was(n*2+1,false);
		for(int j=1;j<=n*2;j++){
			if(was[j])continue;
			vector<int> all;
			for(int i=1;i<=n*2;i++)if(i!=j)all.pb(i);
			while(all.size()>1){
				vector<int> v[2];
				for(int i=0;i<all.size();i++)v[i&1].pb(all[i]);
				int A=Query(v[0]);
				v[0].pb(j);
				int B=Query(v[0]);
				v[0].pop_back();
				if(A==B)all=v[0];
				else all=v[1];
			}
			was[all[0]]=was[j]=true;
			Answer(j,all[0]);
		}
	}
}

Compilation message (stderr)

chameleon.cpp: In function 'void Solve(int)':
chameleon.cpp:44:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<all.size();i++)v[i&1].pb(all[i]);
                 ~^~~~~~~~~~~

• Subtask 1: 4 / 4
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 0 / 20
• Subtask 5: 0 / 36