Submission #139719

#	Time	Username	Problem	Language	Result	Execution time	Memory
139719		Kewo	Combo (IOI18_combo)	C++17	5 / 100	1 ms	200 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define pb push_back
#define ppb pop_back
#define fi first
#define se second
#define mid ((x + y) / 2)
#define left (ind * 2)
#define right (ind * 2 + 1)
#define mp make_pair
#define timer ((double)clock() / CLOCKS_PER_SEC)
#define endl "\n"
#define spc " "
#define d1(x) cerr<<#x<<":"<<x<<endl
#define d2(x, y) cerr<<#x<<":"<<x<<" "<<#y<<":"<<y<<endl
#define d3(x, y, z) cerr<<#x<<":"<<x<<" "<<#y<<":"<<y<<" "<<#z<<":"<<z<<endl
#define fast_io() ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;

typedef long long int lli;
typedef pair<int, int> ii;
typedef pair<ii, int> iii;
typedef pair<double, double> dd;

const int N = (int)(1e6 + 5);
const int LOG = (int)(20);

string s;
set<char> ost;
vector<char> oth;

std::string guess_sequence(int N) {
	ost.insert('A');
	ost.insert('B');
	ost.insert('X');
	ost.insert('Y');
	
	if(press("AB") != 0) {
		if(press("A") != 0) {
			s.pb('A');
			ost.erase('A');
		}
		else {
			s.pb('B');
			ost.erase('B');
		}
	}
	else {
		if(press("X") != 0) {
			s.pb('X');
			ost.erase('X');
		}
		else {
			s.pb('Y');
			ost.erase('Y');
		}
	}
	for(auto i : ost)
		oth.pb(i);

	for(int i = 1; i < N - 1; i++) {
		string ask = s + oth[0] + s + oth[1] + oth[0] + s + oth[1] + oth[1] + s + oth[1] + oth[2];
		int re = press(ask);
		if(re == s.size())
			s.pb(oth[2]);
		if(re == s.size() + 1)
			s.pb(oth[0]);
		if(re == s.size() + 2)
			s.pb(oth[1]);
	}
	if(press(s + oth[0] + s + oth[1]) == s.size() + 1) {
		if(press(s + oth[0]) == s.size() + 1)
			return s + oth[0];
		else
			return s + oth[1];
	}
	else
		return s + oth[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:64:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   64 |   if(re == s.size())
      |      ~~~^~~~~~~~~~~
combo.cpp:66:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   66 |   if(re == s.size() + 1)
      |      ~~~^~~~~~~~~~~~~~~
combo.cpp:68:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   68 |   if(re == s.size() + 2)
      |      ~~~^~~~~~~~~~~~~~~
combo.cpp:71:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   71 |  if(press(s + oth[0] + s + oth[1]) == s.size() + 1) {
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:72:24: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   72 |   if(press(s + oth[0]) == s.size() + 1)
      |      ~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

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