Submission #701029

#	Time	Username	Problem	Language	Result	Execution time	Memory
701029		BobCompetitiveProgramming	Combo (IOI18_combo)	C++14	10 / 100	227 ms	568 KiB

combo

#include <bits/stdc++.h>
using namespace std; using ll=long long;

/*
int press(string s){
    cout << " IN PRESS, ans with string s =  " << s << endl;
    ll ret; cin>>ret;
    return ret;
}
*/

int press(std::string p);

string getRandom(string start, string no, int sz){
    while(start.size() < sz){
        int r = rand() % 4 + 1;
        if(r==1 && "A" != no) start += "A";
        if(r==2 && "B" != no) start += "B";
        if(r==3 && "X" != no) start += "X";
        if(r==4 && "Y" != no) start += "Y";
    }
    return start; 
}

string guess_sequence(int N){
    string S = "", first;
    vector<string> buttons{"A", "B", "X", "Y"};
    for(auto& button : buttons)
        if(button=="Y" || press(button)){
            first = button, S += button;
            break;
        }
    while(true){
        if(S.size() == N) 
            return S; 

        
        for(auto& button : buttons) {
            if(button == first)
                continue;
            
            string ra = getRandom(button, first, S.size());
            int ret = press(S+ra);
            if(ret>S.size())
                S += ra.substr(0, ret-S.size());

            /*
            if(button=="Y" || (first=="Y" && button =="X") || press(S + button) > S.size()) {
                S += button;
                break;
            }
            */
        }
        
    }   
}

/*
int main(){
    guess_sequence(5);
}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string getRandom(std::string, std::string, int)':
combo.cpp:15:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   15 |     while(start.size() < sz){
      |           ~~~~~~~~~~~~~^~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:34:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   34 |         if(S.size() == N)
      |            ~~~~~~~~~^~~~
combo.cpp:44:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |             if(ret>S.size())
      |                ~~~^~~~~~~~~

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