Submission #523436

#	Time	Username	Problem	Language	Result	Execution time	Memory
523436		dron_rp	Combo (IOI18_combo)	C++14	30 / 100	52 ms	300 KiB

combo

#include "combo.h"
#include <set>
#include <iostream>

using namespace std;

string guess_sequence(int N) {
    string S = "";
    set<char> a = {'A', 'B', 'X', 'Y'};
    string p = "";
    for (auto& c : a){
        p = "";
        p += c;
        int coins = press(p);
        if (coins == 1){
            S += c;
            a.erase(c);
            break; 
        }
    }
    //cout << S << "\n";
    while ((int) S.size() < N){
        int idx = 1;
        for (auto& c : a){
            /*
            if (idx >= 3) break;
            p = S;
            p += c;
            int coins = press(p);
            if (coins == (int) S.size()+1){
                S += c;
                break;
            } 
            idx++;
            */
            p = S;
            for (int i = 0; i<N-S.size(); i++){
                p += c;
            }
            int coins = press(p);
            p = "";
            if (coins > S.size()){
                for (int i = 0; i<coins-S.size(); i++){
                    p += c;
                }   
            }
            S += p;
        }
        //cout << idx << "\n";
        //if (idx >= 3) S += *prev(a.end());
        //cout << S << "\n";
    }
    return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:37:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |             for (int i = 0; i<N-S.size(); i++){
      |                             ~^~~~~~~~~~~
combo.cpp:42:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |             if (coins > S.size()){
      |                 ~~~~~~^~~~~~~~~~
combo.cpp:43:34: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |                 for (int i = 0; i<coins-S.size(); i++){
      |                                 ~^~~~~~~~~~~~~~~
combo.cpp:23:13: warning: unused variable 'idx' [-Wunused-variable]
   23 |         int idx = 1;
      |             ^~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95