Submission #108456

#	Time	Username	Problem	Language	Result	Execution time	Memory
108456		reda	Combo (IOI18_combo)	C++14	100 / 100	55 ms	556 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string a="ABXY", b="AB", d, s;
string guess_sequence(int n) {

	if(!press("AB"))
		b="XY";
	char f=b[0];
	if(!press(b.substr(0, 1)))
		f=b[1];
	for(char c : a)
		if(c!=f)// the firs char appears only once
			d+=c;
	s+=f;
	if(n<=1)
		return s;
	while(s.size()<n-1)
		s+=d[press(s+d[1]+s+d[2]+d[0]+s+d[2]+d[1]+s+d[2]+d[2])-s.size()];
	if(press(s+d[0]+s+d[1])>s.size()) {/*If the next character is 'B', then is s+1 returned. If it is 'X', then s+2is
returned. If it is 'Y', then s is returned.*/
		if(press(s+d[0])>s.size())
			return s+d[0];
		return s+d[1];
	}
	return s+d[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:16: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |  while(s.size()<n-1)
      |        ~~~~~~~~^~~~
combo.cpp:20:25: 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(press(s+d[0]+s+d[1])>s.size()) {/*If the next character is 'B', then is s+1 returned. If it is 'X', then s+2is
      |     ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
combo.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   if(press(s+d[0])>s.size())
      |      ~~~~~~~~~~~~~^~~~~~~~~

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