Submission #1322321

#	Time	Username	Problem	Language	Result	Execution time	Memory
1322321		cesh	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

string guess_sequence(ll n) {
    vector<vector<ll>> is(n, vector<ll>(4));
    string f = "AX";
    ll c = press(f);
    string ans;
    vector<char> g;
    if (c >= 1) {
        f = "A";
        c = press(f);
        if (c >= 1) {
            for (ll i = 1; i < n; i++) is[i][0] = 1;
            ans.push_back('A');
            g.push_back('X');
            g.push_back('B');
            g.push_back('Y');
        } else {
            for (ll i = 1; i < n; i++) is[i][1] = 1;
            ans.push_back('X');
            g.push_back('A');
            g.push_back('B');
            g.push_back('Y');
        }
    } else {
        f = "B";
        c = press(f);
        if (c >= 1) {
            for (ll i = 1; i < n; i++) is[i][0] = 1;
            ans.push_back('B');
            g.push_back('A');
            g.push_back('X');
            g.push_back('Y');
        } else {
            for (ll i = 1; i < n; i++) is[i][1] = 1;
            ans.push_back('Y');
            g.push_back('A');
            g.push_back('X');
            g.push_back('B');
        }
    }
    for (ll i = 1; i < n - 1; i++) {
        string f = ans + g[0] + ans + g[1] + g[0] + ans + g[1] + g[1] + ans + g[1] + g[2];
        c = press(f);
        if (c >= ans.size() + 2) ans.push_back(g[1]);
        else if (c >= ans.size() + 1) ans.push_back(g[0]);
        else ans.push_back(g[2]);
    }
    c = press(ans + g[0]);
    if (c >= ans.size() + 1) ans.push_back(g[0]);
    else {
        c = press(ans + g[1]);
        if (c >= ans.size() + 1) ans.push_back(g[1]);
        else ans.push_back(g[2]);
    }
    return ans;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccY0SUUf.o: in function `main':
grader.cpp:(.text.startup+0x4b): undefined reference to `guess_sequence[abi:cxx11](int)'
collect2: error: ld returned 1 exit status