Submission #957004

#	Time	Username	Problem	Language	Result	Execution time	Memory
957004		mostafa133	Combo (IOI18_combo)	C++14	100 / 100	17 ms	1800 KiB

combo

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "combo.h"
typedef long long ll;
typedef long double ld;
using namespace std;
using namespace __gnu_pbds;
using ordered_set = tree<ll, null_type, less<ll>, rb_tree_tag, tree_order_statistics_node_update>;
#define all(x) x.begin(), x.end()
#define fast ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0)
const ll mod = 998244353;
std::string guess_sequence(int N)
{
    string x = "ABXY";
    vector<string> y(4);
    char z;
    string ans;
    ll b = press("AB");
    if (b)
    {
        if (press("A"))
        {
            ans.push_back('A');
            // y = "BXBXXXY";
            y[0] = "B", y[1] = "XB", y[2] = "XX", y[3] = "XY";
            z = 'Y';
        }
        else
        {
            ans.push_back('B');
            ;y[0] = "A", y[1] = "XA", y[2] = "XX", y[3] = "XY";
            z = 'Y';
        }
    }
    else
    {
        if (press("X"))
        {
            ans.push_back('X');
            // y = "ABABYBB";
            y[0] = "A", y[1] = "BA", y[2] = "BB", y[3] = "BY";
            z = 'Y';
        }
        else
        {
            ans.push_back('Y');
            // y = "ABABXBB";
            y[0] = "A", y[1] = "BA", y[2] = "BB", y[3] = "BX";
            z = 'X';
        }
    }
    // cout << ans << ' ';
    for (int i = 1; i < N - 1; i++)
    {
        ll m = ans.size();
        b = press(ans + y[0] + ans + y[1] + ans + y[2] + ans + y[3]);
        // std::cout << b;
        if (b == m + 1)
        {
            ans.push_back(y[0][0]);
        }
        else if (b == m + 2)
        {
            ans.push_back(y[1][0]);
        }
        else
        {
            ans.push_back(z);
        }
    }
    if(N==1)
    {
        return ans;
    }
    if (press(ans + 'A' + ans + 'B') != ans.size())
    {
        if (press(ans + 'A') != ans.size())
        {
            ans.push_back('A');
        }
        else
        {
            ans.push_back('B');
        }
    }
    else
    {
        if (press(ans + 'X') != ans.size())
        {
            ans.push_back('X');
        }
        else
        {
            ans.push_back('Y');
        }
    }
    // cout << ans<<' ';
    return ans;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:76:38: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |     if (press(ans + 'A' + ans + 'B') != ans.size())
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:78:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   78 |         if (press(ans + 'A') != ans.size())
      |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:89:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   89 |         if (press(ans + 'X') != ans.size())
      |             ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~

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