Submission #254609

#	Time	Username	Problem	Language	Result	Execution time	Memory
254609		Erkhemkhuu	Combo (IOI18_combo)	C++17	94 / 100	42 ms	640 KiB

combo

#include <bits/stdc++.h>
#include <combo.h>
using namespace std;
#define ll long long
#define pb push_back
#define mk make_pair
#define F first
#define S second
string guess_sequence(int n) {
    string res, seq;
    int i;
    if(press("AB")) {
        if(press("B")) {
            res = "B";
            seq = "AXY";
        }
        else {
            res = "A";
            seq = "BXY";
        }
    }
    else {
        if(press("X")) {
            res = "X";
            seq = "ABY";
        }
        else {
            res = "Y";
            seq = "ABX";
        }
    }
    if(n == 1) return res;
    for(i = 1; i < n - 1; i++) {
        string temp = "";
        temp = res + seq[0];
        temp += res + seq[1] + seq[0];
        temp += res + seq[1] + seq[1];
        temp += res + seq[1] + seq[2];
        int ret = press(temp);
        if(ret == res.size() + 1) res += seq[0];
        else if(ret == res.size() + 2) res += seq[1];
        else res += seq[2];
    }
    if(press(res) + 1 == n) {
        for(i = 0; i < 3; i++)
            if(press(res + seq[i]) == n) return res + seq[i];
    }
    return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:40:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |         if(ret == res.size() + 1) res += seq[0];
      |            ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:41:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |         else if(ret == res.size() + 2) res += seq[1];
      |                 ~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 89 / 95