Submission #1250321

#	Time	Username	Problem	Language	Result	Execution time	Memory
1250321		ubormaci	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <iostream>
#include <algorithm> // for sort, mainly
#include <vector>
#include <map>
#include <set>
#include <cmath>
#include <array>
#include <string>
#include <cstdio>
#include <iterator>
#include <unordered_set>
#include <cstdint> // for int64_t, int32_t, etc
#include <queue>
#include <stack>
#include <deque>
#include <numeric> // gcd, lcm
#include <fstream>
#include <bitset> // for bitset
#include <iomanip>
#include <cassert> // for set with custom ordering
#include <type_traits> // for set with custom ordering
#include <utility> // for swap, forward, etc
using namespace std;

#pragma GCC optimize("O2")
// #pragma GCC optimize("O1","O2","O3","Ofast","unroll-loops")
//#pragma GCC target("sse","sse2","sse3","sse4.1","sse4.2","avx","avx2","fma")

template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) { return os << '(' << p.first << ", " << p.second << ')'; }
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) { os << '{'; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << '}'; }
void dbg_out() { cout << endl; }
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cout << ' ' << H; dbg_out(T...); }
#ifdef LOCAL
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

/*

notes:

int64_t
stoi(string s) -> string to int
to_string() -> int (or else) to string

vector declaration:
vector<ll> v(n, 0)
vector<vector<ll>> v(n, vector<ll>(n, 0));

{if statement} ? {truth value} : {false value}

set lower bound/upper bound:
 	// . . . m1 . . . d . . . . m2
    auto m1_it = b.lower_bound(d);
    advance(m1_it, -1);
    m1 = *m1_it;
	m2 = *b.upper_bound(d);

#ifdef LOCAL
    freopen("in.txt","r",stdin);
    freopen("out.txt","w",stdout);
#endif

constexpr auto lcm(auto x, auto... xs)
{
	return ((x = std::lcm(x, xs)), ...);
}

std::gcd(int a, int b)

cout << setprecision(n);

set with custom ordering
set<ll, decltype(&cmp)> qu(cmp);

*/

typedef int64_t ll;

string guess_sequence(int N) {

    ll n = N;

    string ans = "";
    // a lenyeg az, hogy hatarozzuk meg, melyik a legelso karakter

    ll first = -1;

    vector<char> v(4, 'z');
    v[0] = 'A';
    v[1] = 'B';
    v[2] = 'X';
    v[3] = 'Y';

    for(ll i = 0; i < 4; i++) {
        string temp = "" + v[i];
        ll g = press(temp);

        if(g == 1) {
            first = i;
            ans += v[i];
            break;
        }
    }

    for(ll i = 2; i <= n; i++) {

        for(ll j = 0; j < 4; j++) {

            if(j == first) {
                continue;
            }

            string temp = ans + v[j];

            ll g = press(temp);
            if(g == i) {
                ans = temp;
                break;
            }
        }
    }

    return ans;

}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:98:16: error: 'press' was not declared in this scope
   98 |         ll g = press(temp);
      |                ^~~~~
combo.cpp:117:20: error: 'press' was not declared in this scope
  117 |             ll g = press(temp);
      |                    ^~~~~