Submission #416167

#	Time	Username	Problem	Language	Result	Execution time	Memory
416167		2fat2code	Combo (IOI18_combo)	C++17	100 / 100	35 ms	612 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define all(a) (a).begin(), (a).end()
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define sz() size()
#define fr first
#define sc second
#define pi pair<int,int>
#define pii pair<pair<int,int>,int>
#define mp make_pair
//#define int long long
#define rc(s) return cout<<s,0
#define rcc(s) cout<<s,exit(0)
using namespace std;
 
const int mod=1e9+7;
const int modp=1999999973;
const int modulo=998244353;
 
vector<char>ch;
vector<char>ch2;
 
string guess_sequence(int N) {
    ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
    srand(chrono::steady_clock::now().time_since_epoch().count());
    string tz;
    ch.push_back('Y');
    ch.push_back('A');
    ch.push_back('B');
    ch.push_back('X');
    if(press("AB")){
        if(press("A")) tz+='A';
        else tz+='B';
    }
    else{
        if(press("X")) tz+='X';
        else tz+='Y';
    }
    for(int i=0;i<ch.size();i++){
        if(ch[i]!=tz.back()) ch2.push_back(ch[i]);
    }
    for(int i=1;i<(N-1);i++){
       // random_shuffle(all(ch2));
        string ask=(tz+ch2[0]+ch2[0]+tz+ch2[0]+ch2[1]+tz+ch2[0]+ch2[2]+tz+ch2[1]);
        int g=press(ask);
        if(g==(i+2)) tz.push_back(ch2[0]);
        else if(g==(i+1)) tz.push_back(ch2[1]);
        else tz.push_back(ch2[2]);
    }
    if(N>=2){
      //  random_shuffle(all(ch2));
        for(int i=0;i<=1;i++){
            tz+=ch2[i];
            if(press(tz)==N) goto next1;
            tz.pop_back();
        }
        tz+=ch2[2];
        next1:;
    }
    return tz;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:43:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |     for(int i=0;i<ch.size();i++){
      |                 ~^~~~~~~~~~

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