Submission #493036

#	Time	Username	Problem	Language	Result	Execution time	Memory
493036		buidangnguyen05	Combo (IOI18_combo)	C++14	100 / 100	38 ms	556 KiB

combo

#include<bits/stdc++.h>
#include "combo.h"
using namespace std;

string guess_sequence(int n) {
    string s="";
    if(press("AB")) s.push_back((press("A") ? 'A' : 'B'));
    else s.push_back((press("X")) ? 'X' : 'Y');

    if(n==1) return s;

    vector<char> ord;
    if(s[0]!='A') ord.push_back('A');
    if(s[0]!='B') ord.push_back('B');
    if(s[0]!='X') ord.push_back('X');
    if(s[0]!='Y') ord.push_back('Y');

    for(int i=1; i<n-1; ++i) {
        int len=press(s+ord[0] + s+ord[1]+ord[0] + s+ord[1]+ord[1] + s+ord[1]+ord[2]);
        if(len==s.size()) s.push_back(ord[2]);
        else if(len==s.size()+1) s.push_back(ord[0]);
        else s.push_back(ord[1]);
    }

    if(press(s+ord[0] + s+ord[1]) == s.size()) s.push_back(ord[2]);
    else s.push_back((press(s+ord[0])==n ? ord[0] : ord[1]));

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |         if(len==s.size()) s.push_back(ord[2]);
      |            ~~~^~~~~~~~~~
combo.cpp:21:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         else if(len==s.size()+1) s.push_back(ord[0]);
      |                 ~~~^~~~~~~~~~~~
combo.cpp:25:35: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   25 |     if(press(s+ord[0] + s+ord[1]) == s.size()) s.push_back(ord[2]);
      |        ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~

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