Submission #114862

#	Time	Username	Problem	Language	Result	Execution time	Memory
114862		dsjong	Combo (IOI18_combo)	C++14	100 / 100	58 ms	460 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;
string a="ABXYABXY";
string s="";
string guess_sequence(int N){
	int idx;
	if(press("AB")){
		if(press("A")) s+='A';
		else s+='B';
	}
	else{
		if(press("X")) s+='X';
		else s+='Y';
	}
	if(s[0]=='A') idx=0;
	else if(s[0]=='B') idx=1;
	else if(s[0]=='X') idx=2;
	else idx=3;
	for(int i=1;i<N;i++){
		if(s.size()<N-1){
			string q=s+a[idx+1]+a[idx+1]+s+a[idx+1]+a[idx+2]+s+a[idx+1]+a[idx+3]+s+a[idx+2];
			int ans=press(q);
			if(ans==s.size()+2) s+=a[idx+1];
			else if(ans==s.size()+1) s+=a[idx+2];
			else s+=a[idx+3];
		}
		else{
			string q=s+a[idx+1]+s+a[idx+2];
			string q2;
			if(press(q)==s.size()+1){
				q2=s+a[idx+1];
				if(press(q2)==s.size()+1) s+=a[idx+1];
				else s+=a[idx+2];
			}
			else{
				s+=a[idx+3];
			}
		}
	}
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:14: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   22 |   if(s.size()<N-1){
      |      ~~~~~~~~^~~~
combo.cpp:25:10: 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(ans==s.size()+2) s+=a[idx+1];
      |       ~~~^~~~~~~~~~~~
combo.cpp:26:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |    else if(ans==s.size()+1) s+=a[idx+2];
      |            ~~~^~~~~~~~~~~~
combo.cpp:32:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |    if(press(q)==s.size()+1){
      |       ~~~~~~~~^~~~~~~~~~~~
combo.cpp:34:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     if(press(q2)==s.size()+1) s+=a[idx+1];
      |        ~~~~~~~~~^~~~~~~~~~~~

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