Submission #220007

#	Time	Username	Problem	Language	Result	Execution time	Memory
220007		Basilhijaz	Combo (IOI18_combo)	C++14	100 / 100	38 ms	552 KiB

combo

#include <combo.h>

using namespace std;

string guess_sequence(int N) {
    string p = "";
    string ans = "";
    string ABX = "";
    int a = press("AB");
    int b = press("AX");
    if(a && b){
        ans += 'A';
        ABX = "BXY";
    }
    else if(a && !b){
        ans += 'B';
        ABX = "AXY";
    }
    else if(!a && b){
        ans += 'X';
        ABX = "ABY";
    }
    else{
        ans += 'Y';
        ABX = "ABX";
    }
    for(int i = 0; i < N - 2; i++){
        p = "";
        p += ans;
        p += ABX[0];
        p += ans;
        p += ABX[1];
        p += ABX[1];
        p += ans;
        p += ABX[1];
        p += ABX[0];
        p += ans;
        p += ABX[1];
        p += ABX[2];
        int num = press(p);
        if(num == i + 1){
            ans += ABX[2];
        }
        else if(num == i + 2){
            ans += ABX[0];
        }
        else{
            ans += ABX[1];
        }
    }
    bool ok = 1;
    if(ans.size() == N) return ans;
    for(int i = 0; i < 2; i++){
        p = "";
        p += ans;
        p += ABX[i];
        if(press(p) == N && ok){
            ans += ABX[i];
            ok = 0;
            break;
        }
    }
    if(ok){
        ans += ABX[2];
    }
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:52:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |     if(ans.size() == N) return ans;
      |        ~~~~~~~~~~~^~~~

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