Submission #292134

#	Time	Username	Problem	Language	Result	Execution time	Memory
292134		CSQ31	Combo (IOI18_combo)	C++14	100 / 100	50 ms	552 KiB

combo

#pragma GCC optimize("Ofast") 
#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
#define pb push_back
#define fi first
#define se second
#define sz(a) a.size()
#define all(a) a.begin(),a.end()
#define lb lower_bound
#define ub upper_bound
#define owo ios_base::sync_with_stdio(0);cin.tie(0);
#define INF (ll)(1e18)
#define debug(...) fprintf(stderr, __VA_ARGS__),fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false);\
debug("%s time : %.4fs\n", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))
typedef long long int ll;
typedef long double ld;
typedef pair<ll,ll> PII;
typedef pair<int,int> pii;
typedef vector<vector<int>> vii;
typedef vector<vector<ll>> VII;
ll gcd(ll a,ll b){if(!b)return a;else return gcd(b,a%b);}
string guess_sequence(int n){
	char fst;
	if(press("AB") >= 1){
		if(press("A")==1)fst='A';
		else fst = 'B';
	}else{
		if(press("X")==1)fst='X';
		else fst = 'Y';
	}
	string s;
	for(char j:{'A','B','X','Y'}){
		if(j != fst)s+=j;
	}
	string res;
	res+=fst;
	for(int i=1;4*i+7<=4*n;i++){
		string p=res+s[0]+s[0]+res+s[0]+s[1]+res+s[0]+s[2]+res+s[1];
		int now = press(p);
		if(now == i+2)res+=s[0];
		else if(now == i+1)res+=s[1];
		else res+=s[2];
	}
	if((int)(res.length()) == n-1){
	if(press(res+"A"+res+"B") == n){
		if(press(res+"A")==n)res+="A";
		else res+="B";
	}else{
		if(press(res+"X")==n)res+="X";
		else res+= "Y";
	}
}
    //cout<<res<<'\n';
	return res;
}

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