Submission #1010216

#	Time	Username	Problem	Language	Result	Execution time	Memory
1010216		baotoan655	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
#ifdef ONLINE_JUDGE
#include "combo.h"
#endif
#define file(name)  if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define FOR(i, a, b) for(int i = (a); i <= (b); ++i)
#define FOD(i, b, a) for(int i = (b); i >= (a); --i)
#define ll long long
#define fi first 
#define se second

using namespace std;

#ifndef ONLINE_JUDGE
int press(string p) {
    // cout << p << '\n';
    int x;
    cin >> x;
    return x;
}
#endif

string guess_sequence(int N) {
    string s;
    if(press("AB")) {
        if(press("A")) s = "A";
        else s = "B";
    } else {
        if(press("X")) s = "X";
        else s = "Y";
    }
    vector<string> ve;
    for(string str : {"A", "B", "X", "Y"}) if(str != s) ve.emplace_back(str);

    while(s.size() < N) {
        // cout << s << ' ';
        string p;
        p = s;
        p += ve[0];
        p += s;
        p += ve[1]; p += ve[0];
        p += s;
        p += ve[1]; p += ve[1];
        p += s;
        p += ve[1]; p += ve[2];

        int res = press(p);
        int sz = s.size();
        if(res == sz + 1) s += ve[0];
        else if(res == sz + 2) s += ve[1];
        else s += ve[2];
    }
    return s;
}

#ifndef ONLINE_JUDGE 
int32_t main() {
    string s;
    cin >> s;
    string tmp = guess_sequence((int)s.size());
    cout << tmp;
}
#endif

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:35:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   35 |     while(s.size() < N) {
      |           ~~~~~~~~~^~~
/usr/bin/ld: /tmp/ccpXrh0c.o: in function `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/cc1WUjFc.o:combo.cpp:(.text+0xc0): first defined here
/usr/bin/ld: /tmp/ccpXrh0c.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc1WUjFc.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status