Submission #89367

#	Time	Username	Problem	Language	Result	Execution time	Memory
89367		jhnah917	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <vector>
using namespace std;
 
string guess_sequence(int N) {
	string arr = "";
	string key = "ABXY";
	char c;
	//i = 1
	if(press("AB") > 0){
		if(press("A") > 0) c = 'A';
		else c = 'B';
	}else if(press("X") > 0){
		c = 'X';
	}else c = 'Y';
	
	for(auto i : key) if(i!=c) arr += i;
	string s = c;
	//2~N-1
	for(int i=2; i<=N-1; i++){
		string q = "";
		q += s; q += arr[0]; q += arr[0];
		q += s; q += arr[0]; q += arr[1];
		q += s; q += arr[0]; q += arr[2];
		q += s; q += arr[1]; q += s;
		int val = press(q);
		if(val == i-1) s += arr[2];
		if(val == i) s += arr[1];
		if(val == i+1) s += arr[0];
	}
	
	//N
	if(press(s + arr[0]) == N) s += arr[0];
	else if(press(s + arr[1]) == N) s += arr[1];
	else s += arr[2];
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:13: error: conversion from 'char' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
   18 |  string s = c;
      |             ^