Submission #896119

#	Time	Username	Problem	Language	Result	Execution time	Memory
896119		wood	Combo (IOI18_combo)	C++17	5 / 100	1 ms	596 KiB

combo

#include <bits/stdc++.h>  
using namespace std;
 
typedef long long ll;
typedef pair<int,int> p32;
typedef pair<ll,ll> p64;
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
#define fast_cin() ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL)

int press(string p);

string guess_sequence(int n){
    char start;
    if(press("AB")){
        if(press("A"))
        start = 'A';
        else start = 'B';
    } 
    else{
        if(press("X"))
        start = 'X';
        else start = 'Y';
    }
    string p = "";
    p+=start;
    vector<char> ch = {'A','B','X','Y'};
    ch.erase(lower_bound(ch.begin(),ch.end(),start));
    for (size_t i = 0; i < n-2; i++)
    {
        int guess = press(p+ch[0]+ch[0]+p+ch[0]+ch[1]+p+ch[0]+ch[2]+p+ch[1]);
        if(guess==p.size()+2) p+=ch[0];
        else if(guess==p.size()+1) p+=ch[1];
        else p+=ch[2];
    }
    if(press(p+ch[0])==n) return p+ch[0]+'\n';
    else if(press(p+ch[1])==n) return p+ch[1]+'\n';
    else return p+ch[2]+'\n';
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:26: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   31 |     for (size_t i = 0; i < n-2; i++)
      |                        ~~^~~~~
combo.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |         if(guess==p.size()+2) p+=ch[0];
      |            ~~~~~^~~~~~~~~~~~
combo.cpp:35:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         else if(guess==p.size()+1) p+=ch[1];
      |                 ~~~~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95