Submission #101900

#	Time	Username	Problem	Language	Result	Execution time	Memory
101900		joylintp	Combo (IOI18_combo)	C++17	100 / 100	67 ms	568 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(int n)
{
    string ans;
    char c[3];

    int tmp = press("AB");
    if (tmp == 2)
        ans += "AB", c[0] = 'B', c[1] = 'X', c[2] = 'Y';
    else if (tmp == 1)
        if (press("A"))
            ans += "A", c[0] = 'B', c[1] = 'X', c[2] = 'Y';
        else
            ans += "B", c[0] = 'A', c[1] = 'X', c[2] = 'Y';
    else
        if (press("X"))
            ans += "X", c[0] = 'A', c[1] = 'B', c[2] = 'Y';
        else
            ans += "Y", c[0] = 'A', c[1] = 'B', c[2] = 'X';

    if (ans.size() == n)
        return ans;
    while  (ans.size() <= n - 2)
    {
        int tmp = press(ans + c[0] + c[1] + ans + c[0] + c[2] + ans + c[0] + c[0] + ans + c[1]);
        if (tmp == ans.size() + 2)
            ans += c[0];
        else if (tmp == ans.size() + 1)
            ans += c[1];
        else
            ans += c[2];
    }
    if (press(ans + c[0]) == n)
        return ans + c[0];
    else if (press(ans + c[1]) == n)
        return ans + c[1];
    else
        return ans + c[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:25:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   25 |     if (ans.size() == n)
      |         ~~~~~~~~~~~^~~~
combo.cpp:27:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   27 |     while  (ans.size() <= n - 2)
      |             ~~~~~~~~~~~^~~~~~~~
combo.cpp:30:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |         if (tmp == ans.size() + 2)
      |             ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         else if (tmp == ans.size() + 1)
      |                  ~~~~^~~~~~~~~~~~~~~~~

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