Submission #1010219

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010219		baotoan655	Combo (IOI18_combo)	C++14	100 / 100	20 ms	2084 KiB

combo

#include <bits/stdc++.h>
// #ifdef ONLINE_JUDGE
#include "combo.h"
// #endif
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define ll long long
#define fi first 
#define se second

using namespace std;



string guess_sequence(int N) {
    string s;
    if(press("AB")) {
        if(press("A")) s = "A";
        else s = "B";
    } else {
        if(press("X")) s = "X";
        else s = "Y";
    }
    if(N == 1) return s;
    vector<string> ve;
    for(string str : {"A", "B", "X", "Y"}) if(str != s) ve.emplace_back(str);

    while(s.size() < N - 1) {
        // cout << s << ' ';
        string p;
        p = s;
        p += ve[0];
        p += s;
        p += ve[1]; p += ve[0];
        p += s;
        p += ve[1]; p += ve[1];
        p += s;
        p += ve[1]; p += ve[2];

        int res = press(p);
        int sz = s.size();
        if(res == sz + 1) s += ve[0];
        else if(res == sz + 2) s += ve[1];
        else s += ve[2];
    }
    if(press(s + ve[0]) == N) return s + ve[0];
    else if(press(s + ve[1]) == N) return s + ve[1];
    else return s + ve[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:29:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   29 |     while(s.size() < N - 1) {
      |           ~~~~~~~~~^~~~~~~

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