Submission #587831

#	Time	Username	Problem	Language	Result	Execution time	Memory
587831		IvanJ	Combo (IOI18_combo)	C++17	5 / 100	1 ms	336 KiB

combo

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

#define all(a) (a).begin(), (a).end()

using namespace std;

string guess_sequence(int n) {
	string p = "", S = "";
	if(press("A")) S = "A";
	else if(press("B")) S = "B";
	else if(press("X")) S = "X";
	else S = "Y";
  
	set<string> q;
	q.insert("A"), q.insert("B"), q.insert("X"), q.insert("Y");
	q.erase(S);
	vector<string> v(all(q));
	for(int i = 1;i < n - 1;i++) {
		p = S + v[0];
		for(int j = 0;j < 3;j++) 
			p += S + v[1] + v[j];
		int x = press(p);
		
		if(x == (int)S.size() + 1) S += v[0];
		else if(x == (int)S.size() + 2) S += v[1];
		else S += v[2];
		if(S.size() > (i + 1)) while(1) {}
	}
	assert((int)S.size() <= (n - 1));
	if(press(S + v[0]) == n) S += v[0];
	else if(press(S + v[1]) == n) S += v[1];
	else S += v[2];
	return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:28:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   28 |   if(S.size() > (i + 1)) while(1) {}
      |      ~~~~~~~~~^~~~~~~~~

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