Submission #1018159

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018159		vjudge1	Combo (IOI18_combo)	C++17	100 / 100	23 ms	2092 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define rep(a,b,c) for(int a=b; a<c; a++)

using namespace std;

string guess_sequence(int N) {
	string p, c="ABXY";
	int x;
	if(press("AB")) p=(press("A") ? "A" : "B");
	else p=(press("X") ? "X" : "Y");
	rep(i,0,4){
		if(p[0]==c[i]){
			c.erase(c.begin()+i);
			break;
		}
	}
	rep(i,2,N){
		x=press(p+c[0]+p+c[1]+c[0]+p+c[1]+c[1]+p+c[1]+c[2]);
		if(x==p.size()) p+=c[2];
		else if(x==p.size()+1) p+=c[0];
		else p+=c[1];
	}
	if(N>1){
		if(press(p+c[0]+p+c[1])==N) p+=(press(p+c[0])==N ? c[0] : c[1]);
		else p+=c[2];
	}
	return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:7: 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(x==p.size()) p+=c[2];
      |      ~^~~~~~~~~~
combo.cpp:21:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |   else if(x==p.size()+1) p+=c[0];
      |           ~^~~~~~~~~~~~

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