Submission #657240

#	Time	Username	Problem	Language	Result	Execution time	Memory
657240		device	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int press(string p);
string guess_sequence(int n) {
    string s = "ABXY", str = s[((press("AB") ? 0 : 2) + (press("AX") ? 0 : 1))];
    char c[3];
    int ptr = 0;
    for (char C:s) {
        if (C != str[0]) {
            c[ptr] = C, ptr++;
        }
    }
    if (n == 1) return str;
    for (int i = 2; i < n; i++) {
        string cur = str + c[2] + c[0] + str + c[2] + c[1] + str + c[2] + c[2] + str + c[1];
        int val = press(cur);
        val -= i - 1;
        str += c[val];
    }
    if (press(str + c[0]) == n) str += c[0];
    else if (press(str + c[1]) == n) str += c[1];
    else str += c[2];
    return str;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:6:79: error: conversion from '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    6 |     string s = "ABXY", str = s[((press("AB") ? 0 : 2) + (press("AX") ? 0 : 1))];
      |                                                                               ^