Submission #156892

#	Time	Username	Problem	Language	Result	Execution time	Memory
156892		Evirir	Combo (IOI18_combo)	C++17	100 / 100	52 ms	576 KiB

combo

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "combo.h"
using namespace std;
using namespace __gnu_pbds;

#define watch(x) cout<<(#x)<<"="<<(x)<<'\n'
#define mset(d,val) memset(d,val,sizeof(d))
#define setp(x) cout<<fixed<<setprecision(x)
#define forn(i,a,b) for(int i=a;i<b;i++)
#define fore(i,a,b) for(int i=a;i<=b;i++)
#define pb push_back
#define F first
#define S second
#define INF 2e14
#define MOD 998244353
#define pqueue priority_queue
#define fbo find_by_order
#define ook order_of_key
typedef long long ll;
typedef pair<ll,ll> ii;
typedef vector<ll> vi;
typedef vector<ii> vii;
typedef tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update> pbds;

#define MAXN 100005

vector<string> c = {"A","B","X","Y"};

string guess_sequence(int n){
	string ans="";
	int res;
	
	int beg;
	res=press(c[0]+c[1]);
	if(res){
		res=press(c[0]);
		if(res) beg=0;
		else beg=1;
	}
	else{
		res=press(c[2]);
		if(res) beg=2;
		else beg=3;
	}
	
	ans+=c[beg];
	c.erase(c.begin()+beg);
	
	if(n==1) return ans;
	
	forn(i,1,n-1){
		string p=ans+c[0];
		forn(j,0,3){
			p+=ans+c[1]+c[j];
		}
		
		int res=press(p);
		if(res==i+1) ans+=c[0];
		else if(res==i+2) ans+=c[1];
		else ans+=c[2];
	}
	
	res=press(ans+c[0]+ans+c[1]);	
	if(res==n){
		if(press(ans+c[0])==n) return ans+c[0];
		else return ans+c[1];
	}
	return ans+c[2];
}

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95