Submission #648234

#	Time	Username	Problem	Language	Result	Execution time	Memory
648234		_petar_b	Combo (IOI18_combo)	C++14	100 / 100	35 ms	620 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define MAXN 100010
#define pb push_back
#define ll long long
#define fi first
#define se second
#define mp make_pair

using namespace std;

std::string guess_sequence(int N) {
    char c[4] = {'A', 'B', 'X', 'Y'};
    int coins = press("AB");
    std::string S = "";
    if (coins >= 1)
    {
        coins = press("A");
        if (coins == 1)
        {
            S += "A";
            swap(c[0], c[3]);
        }
        else
        {
            S += "B";
            swap(c[1], c[3]);
        }
    }
    else
    {
        coins = press("X");
        if (coins == 1)
        {
            S += "X";
            swap(c[2], c[3]);
        }
        else
        {
            S += "Y";
        }
    }
    while(S.size() < N-1)
    {
        std::string p = "";
        //1
        p += S;
        p += c[0];
        //2;
        p += S;
        p += c[1];
        p += c[0];
        //3
        p += S;
        p += c[1];
        p += c[1];
        //4
        p += S;
        p += c[1];
        p += c[2];
        coins = press(p);
        if (coins == S.size())
            S += c[2];
        else if (coins == S.size() + 1)
            S += c[0];
        else
            S += c[1];
    }
    if (N == 1)
        return S;
    string p = "";
    p += S;
    p += c[0];
    coins = press(p);
    if (coins == N)
    {
        S += c[0];
        return S;
    }
    p = "";
    p += S;
    p += c[1];
    coins = press(p);
    if (coins == N)
    {
        S += c[1];
        return S;
    }
    S += c[2];
    return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:43:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   43 |     while(S.size() < N-1)
      |           ~~~~~~~~~^~~~~
combo.cpp:62:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   62 |         if (coins == S.size())
      |             ~~~~~~^~~~~~~~~~~
combo.cpp:64:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |         else if (coins == S.size() + 1)
      |                  ~~~~~~^~~~~~~~~~~~~~~

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