Submission #1038527

#	Time	Username	Problem	Language	Result	Execution time	Memory
1038527		boyliguanhan	Combo (IOI18_combo)	C++17	100 / 100	21 ms	1828 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
  string str,buton;
  if(press("AB"))
    if(press("A"))
      str="A",buton="BXY";
    else str="B",buton="AXY";
  else if(press("X"))
      str="X",buton="ABY";
    else str="Y",buton="ABX";
  if(N==1)return str;
  for(int i=2;i<N;i++){
    string str2=str+buton[0]+str+buton[1]+buton[0]+str+buton[1]+buton[1]+str+buton[1]+buton[2];
    assert(str2.size()<4*N);
    int k=press(str2);
    if(k==str.size())str+=buton[2];
    else if(k<str.size()+2)
      str+=buton[0];
    else str+=buton[1];
  };
  if(press(str+buton[0])==N)
    str+=buton[0];
  else if(press(str+buton[1])==N)
    str+=buton[1];
  else str+=buton[2];
  return str;
}

Compilation message (stderr)

In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from combo.cpp:2:
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:16:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   16 |     assert(str2.size()<4*N);
      |            ~~~~~~~~~~~^~~~
combo.cpp:18:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |     if(k==str.size())str+=buton[2];
      |        ~^~~~~~~~~~~~
combo.cpp:19:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     else if(k<str.size()+2)
      |             ~^~~~~~~~~~~~~

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