Submission #807634

#	Time	Username	Problem	Language	Result	Execution time	Memory
807634		kingfran1907	Combo (IOI18_combo)	C++14	100 / 100	29 ms	576 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;

std::string guess_sequence(int N) {
	string S;
	string ls;
	if (press("AB")) {
		if (press("A")) S = "A";
		else S = "B";
	} else {
		if (press("X")) S = "X";
		else S = "Y";
	}
	
	for (char t : "ABXY") {
		if (t != S[0]) ls.push_back(t);
	}
	ls.resize(3);
	//cout << ls.size() << endl;
	
	for (int i = 1; i < N - 1; i++) {
		string qs = S;
		qs.push_back(ls[0]);
		for (char t : ls) {
			qs += S;
			qs.push_back(ls[1]);
			qs.push_back(t);
		}
		
		//cout << "pressing: " << qs << endl;
		//for (char t : qs) printf("%c|", t); printf("\n");
		int out = press(qs);
		if (out == S.size()) S.push_back(ls[2]);
		else if (out == S.size() + 1) S.push_back(ls[0]);
		else S.push_back(ls[1]);
	}
	
	for (int i = 0; i < 2; i++) {
		string qs = S;
		qs.push_back(ls[i]);
		qs.resize(N);
		if (press(qs) == N) return qs;
	}
	S.push_back(ls[2]);
	S.resize(N);
	return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:34:11: 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 (out == S.size()) S.push_back(ls[2]);
      |       ~~~~^~~~~~~~~~~
combo.cpp:35:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |   else if (out == S.size() + 1) S.push_back(ls[0]);
      |            ~~~~^~~~~~~~~~~~~~~

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