Submission #392223

#	Time	Username	Problem	Language	Result	Execution time	Memory
392223		nishuz	Combo (IOI18_combo)	C++17	Compilation error	0 ms	0 KiB

combo

// #pragma GCC optimize("Ofast,unroll-loops")
// #pragma GCC target("avx,avx2,sse,sse2")
 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include "combo.h"
 
using namespace __gnu_pbds;
using namespace std;
 
#define ll long long
#define ld long double
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define pb push_back
#define eb emplace_back
#define F first
#define S second
#define mp make_pair
#define random mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
 
template <typename T> using oset = tree <pair <T, T>, null_type, less <pair <T, T>>, rb_tree_tag, tree_order_statistics_node_update>;

template <typename Container>
void Print(Container& container, int starting) {
    auto Start = container.begin() + starting, End = container.end();
    while (Start != End) cout << *(Start++) << " ";
    cout << '\n';
}
 
template <typename T>
void print(T&& t) {cout << t << '\n';}
 
template <typename T, typename... Args>
void print(T&& t, Args&&... args) {
    cout << t << " ";
    print(forward<Args>(args)...);
}

string guess_sequence(int n) {
    char first = '';
    string s = "";
    for (int i = 1; i <= n; ++i) {
        for (char c : {'A', 'B', 'X', 'Y'}) {
            if (first == c) continue;
            string t = s + c;
            if (press(t) == i) {
                s = t;
                break;
            }
        }
    }
    return s;
}

Compilation message (stderr)

combo.cpp:42:18: error: empty character constant
   42 |     char first = '';
      |                  ^~