Submission #1206948

#	Time	Username	Problem	Language	Result	Execution time	Memory
1206948		a1m4n	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#ifdef AIMAN
#define _GLIBCXX_DEBUG
#endif
#include "combo.h"
#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define pb push_back
#define eb emplace_back
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("fast-math")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("O2")
#pragma GCC target("avx,avx2,fma")
using ll = long long;
const ll INF = 1e9;
using namespace std;

int press(string s) {
    cout << s << "\n" << flush;
    int res;
    if (!(cin >> res)) exit(0);
    return res;
}

string guess_sequence(int n) {
    string ans;
    int matched = 0;
    
 
    int x = press("AB");
    if (x == 0) {

        x = press("X");
        ans += (x == 1 ? 'X' : 'Y');
    } else {
  
        x = press("A");
        ans += (x == 1 ? 'A' : 'B');
    }
    matched = 1;


    while (matched + 2 <= n) {
        char start = ans[0];
        if (start == 'A') {
            x = press(ans + "BB" + ans + "BX" + ans + "BY" + ans + "X");
            if      (x == matched)     ans += 'Y';
            else if (x == matched + 1) ans += 'X';
            else                       ans += 'B';
        }
        else if (start == 'B') {
            x = press(ans + "AA" + ans + "AX" + ans + "AY" + ans + "X");
            if      (x == matched)     ans += 'Y';
            else if (x == matched + 1) ans += 'X';
            else                       ans += 'A';
        }
        else if (start == 'X') {
            x = press(ans + "AA" + ans + "AB" + ans + "AY" + ans + "B");
            if      (x == matched)     ans += 'Y';
            else if (x == matched + 1) ans += 'B';
            else                       ans += 'A';
        }
        else { 
            x = press(ans + "BB" + ans + "BX" + ans + "BA" + ans + "X");
            if      (x == matched)     ans += 'A';
            else if (x == matched + 1) ans += 'X';
            else                       ans += 'B';
        }
        matched++;
    }
    if (matched == n - 1) {
        char start = ans[0];
        if (start == 'A') {
            x = press(ans + "B");
            if (x == n) ans += 'B';
            else {
                x = press(ans + "X");
                ans += (x == n ? 'X' : 'Y');
            }
        }
        else if (start == 'B') {
            x = press(ans + "A");
            if (x == n) ans += 'A';
            else {
                x = press(ans + "X");
                ans += (x == n ? 'X' : 'Y');
            }
        }
        else if (start == 'X') {
            x = press(ans + "A");
            if (x == n) ans += 'A';
            else {
                x = press(ans + "B");
                ans += (x == n ? 'B' : 'Y');
            }
        }
        else {
            x = press(ans + "B");
            if (x == n) ans += 'B';
            else {
                x = press(ans + "X");
                ans += (x == n ? 'X' : 'A');
            }
        }
    }

    return ans;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccwXegOa.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/cc17SV5K.o:combo.cpp:(.text+0x0): first defined here
collect2: error: ld returned 1 exit status