Submission #379307

#	Time	Username	Problem	Language	Result	Execution time	Memory
379307		autumn_eel	Combo (IOI18_combo)	C++14	100 / 100	55 ms	612 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;

std::string guess_sequence(int N) {
	char f;
	if(press("AB")){
		if(press("A"))f='A';
		else f='B';
	}
	else{
		if(press("X"))f='X';
		else f='Y';
	}
	string C="ABXY",D;
	for(char c:C){
		if(c!=f)D+=c;
	}
	string s;s+=f;
	if(N==1)return s;
	for(int i=1;i<N-1;i++){
		string ask;
		ask+=s+D[0];
		rep(j,3)ask+=s+D[1]+D[j];
		int res=press(ask);
		if(res==s.size()+1)s+=D[0];
		else if(res==s.size()+2)s+=D[1];
		else s+=D[2];
	}
	if(press(s+D[0])==s.size()+1){
		s+=D[0];
	}
	else if(press(s+D[1])==s.size()+1){
		s+=D[1];
	}
	else s+=D[2];
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:27:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   if(res==s.size()+1)s+=D[0];
      |      ~~~^~~~~~~~~~~~
combo.cpp:28:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |   else if(res==s.size()+2)s+=D[1];
      |           ~~~^~~~~~~~~~~~
combo.cpp:31:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |  if(press(s+D[0])==s.size()+1){
      |     ~~~~~~~~~~~~~^~~~~~~~~~~~
combo.cpp:34:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |  else if(press(s+D[1])==s.size()+1){
      |          ~~~~~~~~~~~~~^~~~~~~~~~~~

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