Submission #766619

#	Time	Username	Problem	Language	Result	Execution time	Memory
766619		marvinthang	Combo (IOI18_combo)	C++17	100 / 100	24 ms	756 KiB

combo

/*************************************
*    author: marvinthang             *
*    created: 26.06.2023 08:55:53    *
*************************************/

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

using namespace std;

#define                  fi  first
#define                  se  second
#define                left  ___left
#define               right  ___right
#define                TIME  (1.0 * clock() / CLOCKS_PER_SEC)
#define             MASK(i)  (1LL << (i))
#define           BIT(x, i)  ((x) >> (i) & 1)
#define  __builtin_popcount  __builtin_popcountll
#define              ALL(v)  (v).begin(), (v).end()
#define           REP(i, n)  for (int i = 0, _n = (n); i < _n; ++i)
#define          REPD(i, n)  for (int i = (n); i--; )
#define        FOR(i, a, b)  for (int i = (a), _b = (b); i < _b; ++i) 
#define       FORD(i, b, a)  for (int i = (b), _a = (a); --i >= _a; ) 
#define       FORE(i, a, b)  for (int i = (a), _b = (b); i <= _b; ++i) 
#define      FORDE(i, b, a)  for (int i = (b), _a = (a); i >= _a; --i) 
#define        scan_op(...)  istream & operator >> (istream &in, __VA_ARGS__ &u)
#define       print_op(...)  ostream & operator << (ostream &out, const __VA_ARGS__ &u)
#ifdef LOCAL
    #include "debug.h"
#else
    #define file(name) if (fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
    #define DB(...) 23
    #define db(...) 23
    #define debug(...) 23
#endif

template <class U, class V> scan_op(pair <U, V>)  { return in >> u.first >> u.second; }
template <class T> scan_op(vector <T>)  { for (size_t i = 0; i < u.size(); ++i) in >> u[i]; return in; }
template <class U, class V> print_op(pair <U, V>)  { return out << '(' << u.first << ", " << u.second << ')'; }
template <size_t i, class T> ostream & print_tuple_utils(ostream &out, const T &tup) { if constexpr(i == tuple_size<T>::value) return out << ")";  else return print_tuple_utils<i + 1, T>(out << (i ? ", " : "(") << get<i>(tup), tup); }
template <class ...U> print_op(tuple<U...>) { return print_tuple_utils<0, tuple<U...>>(out, u); }
template <class Con, class = decltype(begin(declval<Con>()))> typename enable_if <!is_same<Con, string>::value, ostream&>::type operator << (ostream &out, const Con &con) { out << '{'; for (__typeof(con.begin()) it = con.begin(); it != con.end(); ++it) out << (it == con.begin() ? "" : ", ") << *it; return out << '}'; }

// end of template

string guess_sequence(int N) {
	string S;
	if (press("AB")) S += press("A") ? 'A' : 'B';
	else S += press("X") ? 'X' : 'Y';
	string R;
	for (char c: {'A', 'B', 'X', 'Y'}) if (c != S[0]) R += c;
	FOR(i, 2, N) {
		string a = S + R[0];
		for (char c: R) a += S + R[1] + c;
		int t = press(a);
		if (t == i) S += R[0];
		else if (t == i + 1) S += R[1];
		else S += R[2];
	}
	if (N > 1) {
		REP(i, 2) if (press(S + R[i]) == N) return S + R[i];
		return S + R[2];
	}
	return S;
}

#ifdef LOCAL
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>
#include "combo.h"

namespace {

constexpr int MAX_N = 2000;
constexpr int MAX_NUM_MOVES = 8000;

int N;
std::string S;

int num_moves;

void wrong_answer(const char *MSG) {
	printf("Wrong Answer: %s\n", MSG);
	exit(0);
}

}  // namespace

int press(std::string p) {
	if (++num_moves > MAX_NUM_MOVES) {
		wrong_answer("too many moves");
	}
	int len = p.length();
	if (len > 4 * N) {
		wrong_answer("invalid press");
	}
	for (int i = 0; i < len; ++i) {
		if (p[i] != 'A' && p[i] != 'B' && p[i] != 'X' && p[i] != 'Y') {
			wrong_answer("invalid press");
		}
	}
	int coins = 0;
	for (int i = 0, j = 0; i < len; ++i) {
		if (j < N && S[j] == p[i]) {
			++j;
		} else if (S[0] == p[i]) {
			j = 1;
		} else {
			j = 0;
		}
		coins = std::max(coins, j);
	}
	return coins;
}

int main() {
	file("combo");
	char buffer[MAX_N + 1];
	if (scanf("%s", buffer) != 1) {
		fprintf(stderr, "Error while reading input\n");
		exit(1);
	}
	S = buffer;
	N = S.length();

	num_moves = 0;
	std::string answer = guess_sequence(N);
	if (answer != S) {
		cout << answer << '\n';
		wrong_answer("wrong guess: ");
		exit(0);
	}
	printf("Accepted: %d\n", num_moves);
	return 0;
}
#endif

• Subtask 1: 5 / 5
• Subtask 2: 95 / 95