Submission #254560

#	Time	Username	Problem	Language	Result	Execution time	Memory
254560		Erkhemkhuu	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#include <combo.h>
using namespace std;
#define ll long long
#define pb push_back
#define mk make_pair
#define F first
#define S second
string guess_sequence(int n) {
    string res, seq;
    int i;
    if(press("A")) {
        res = 'A';
        seq = "BXY";
    }
    if(press("B")) {
        res = 'B';
        seq = "AXY";
    }
    if(press("X")) {
        res = 'X';
        seq = "ABY";
    }
    if(press("Y")) {
        res = 'Y';
        seq = "ABX";
    }
    for(i = 1; i < n; i++) {
        string temp = "";
        temp = res + seq[0];
        temp += res + seq[1] + seq[0];
        temp += res + seq[1] + seq[1];
        temp += res + seq[1] + seq[2];
        int ret = press(temp);
        if(ret == res.size() + 1) res += seq[0];
        else if(ret == res.size() + 2) res += seq[1];
        else res += seq[2];
    }
    string temp = "";
    for(i = 0; i < 3; i++) {
        temp = res + seq[i];
        if(press(temp) == n) return temp;
    }
    return -1;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
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 |         if(ret == res.size() + 1) res += seq[0];
      |            ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         else if(ret == res.size() + 2) res += seq[1];
      |                 ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:44:13: error: could not convert '-1' from 'int' to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   44 |     return -1;
      |             ^
      |             |
      |             int