Submission #734750

#	Time	Username	Problem	Language	Result	Execution time	Memory
734750		Cutebol	Combo (IOI18_combo)	C++17	5 / 100	1 ms	228 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std ;
string guess_sequence( int n ) {
	string ans ;
	vector <char> vec = { 'A' , 'B' , 'X' , 'Y' } ;
	int f = 0 ;
	int x = press ( "AB" ) ;
	if (x){
		x = press("A") ;
		if(x) f = 0 ;
		else  f = 1 ;
	}
	else{
		x = press("X") ;
		if(x) f = 2 ;
		else  f = 3 ;
	}
	ans += vec[f] ;
	swap ( vec[3] , vec[f] ) ;
	for ( int i = 1 ; i < n-1 ; i ++ ){
		string cur ;
		for ( int j = 0 ; j < 3 ; j ++ ) cur += ans+vec[0]+vec[j] ;
		cur += ans+vec[1] ;
		x = press(cur) ;
		if ( x == ans.size() ) ans += vec[2] ;
		else if ( x-1 == ans.size() ) ans += vec[1] ;
		else ans += vec[0] ;
	}
	x = press( ans+vec[0]+ans+vec[1] ) ;
	if ( x == ans.size() ) ans += vec[2] ;
	else{
		x = press(ans+vec[0]) ;
		if(x>ans.size()) ans += vec[0] ;
		else ans += vec[1] ;
	}
	return ans ;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:26:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   if ( x == ans.size() ) ans += vec[2] ;
      |        ~~^~~~~~~~~~~~~
combo.cpp:27:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |   else if ( x-1 == ans.size() ) ans += vec[1] ;
      |             ~~~~^~~~~~~~~~~~~
combo.cpp:31:9: 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 ( x == ans.size() ) ans += vec[2] ;
      |       ~~^~~~~~~~~~~~~
combo.cpp:34:7: 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(x>ans.size()) ans += vec[0] ;
      |      ~^~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95