Submission #80316

#	Time	Username	Problem	Language	Result	Execution time	Memory
80316		qkxwsm	Combo (IOI18_combo)	C++14	97 / 100	57 ms	624 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/rope>

using namespace std;
using namespace __gnu_pbds;
using namespace __gnu_cxx;

random_device(rd);
mt19937 rng(rd());
const long long FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();

struct custom_hash
{
	template<class T>
    unsigned long long operator()(T v) const
	{
		unsigned long long x = v;
		x += FIXED_RANDOM; x += 11400714819323198485ull;
        x = (x ^ (x >> 30)) * 13787848793156543929ull;
        x = (x ^ (x >> 27)) * 10723151780598845931ull;
        return x ^ (x >> 31);
    }
};

template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<class T, class U> using hash_table = gp_hash_table<T, U, custom_hash>;

template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
long long expo(long long a, long long e, long long mod)
{
	return ((e == 0) ? 1 : ((expo(a * a % mod, e >> 1, mod)) * ((e & 1) ? a : 1) % mod));
}
template<class T, class U>
T nmod(T &x, U mod)
{
	if (x >= mod) x -= mod;
}
template<class T>
T gcd(T a, T b)
{
	return (b ? gcd(b, a % b) : a);
}
template<class T>
T randomize(T mod)
{
	return (uniform_int_distribution<T>(0, mod - 1))(rng);
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;
#define sz(x) ((int) (x.size()))

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-9;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;

char ch[3];

string guess_sequence(int N)
{
	string ans = "";
	int lol1 = press("A"), lol2 = press("B"), lol3 = press("X");
	if (lol1 == 1)
	{
		ch[0] = 'B'; ch[1] = 'X'; ch[2] = 'Y';
		ans += 'A';
	}
	else if (lol2 == 1)
	{
		ch[0] = 'A'; ch[1] = 'X'; ch[2] = 'Y';
		ans += 'B';
	}
	else if (lol3 == 1)
	{
		ch[0] = 'A'; ch[1] = 'B'; ch[2] = 'Y';
		ans += 'X';
	}
	else
	{
		ch[0] = 'A'; ch[1] = 'B'; ch[2] = 'X';
		ans += 'Y';
	}
	while(ans.length() < N - 1)
	{
		string t = ans + ch[0] + ch[0] + ans + ch[0] + ch[1] + ans + ch[1] + ch[0];
		int x = press(t);
		if (x == ans.length() + 0)
		{
			ans += ch[2];
			continue;
		}
		else if (x == ans.length() + 1)
		{
			t = ans + ch[1] + ch[2];
			x = press(t);
			//ac, bb, bc
			if (x == ans.length() + 0)
			{
				ans += ch[0]; ans += ch[2];
			}
			else if (x == ans.length() + 1)
			{
				ans += ch[1]; ans += ch[1];
			}
			else if (x == ans.length() + 2)
			{
				ans += ch[1]; ans += ch[2];
			}
		}
		else if (x == ans.length() + 2)
		{
			//aa, ab, ba
			t = ans + ch[0] + ch[0];
			x = press(t);
			if (x == ans.length() + 0)
			{
				ans += ch[1]; ans += ch[0];
			}
			else if (x == ans.length() + 1)
			{
				ans += ch[0]; ans += ch[1];
			}
			else if (x == ans.length() + 2)
			{
				ans += ch[0]; ans += ch[0];
			}
		}
	}
	if (ans.length() == N - 1)
	{
		string t = ans + ch[0];
		lol1 = press(t);
		t = ans + ch[1];
		lol2 = press(t);
		if (lol1 == ans.length() + 1) ans += ch[0];
		else if (lol2 == ans.length() + 1) ans += ch[1];
		else ans += ch[2];
	}
	return ans;
}

Compilation message (stderr)

combo.cpp:11:14: warning: unnecessary parentheses in declaration of 'rd' [-Wparentheses]
   11 | random_device(rd);
      |              ^
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:116:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  116 |  while(ans.length() < N - 1)
      |        ~~~~~~~~~~~~~^~~~~~~
combo.cpp:120:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  120 |   if (x == ans.length() + 0)
      |       ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:125:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  125 |   else if (x == ans.length() + 1)
      |            ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:130:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  130 |    if (x == ans.length() + 0)
      |        ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:134:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  134 |    else if (x == ans.length() + 1)
      |             ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:138:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  138 |    else if (x == ans.length() + 2)
      |             ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:143:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  143 |   else if (x == ans.length() + 2)
      |            ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:148:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  148 |    if (x == ans.length() + 0)
      |        ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:152:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |    else if (x == ans.length() + 1)
      |             ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:156:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  156 |    else if (x == ans.length() + 2)
      |             ~~^~~~~~~~~~~~~~~~~~~
combo.cpp:162:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  162 |  if (ans.length() == N - 1)
      |      ~~~~~~~~~~~~~^~~~~~~~
combo.cpp:168:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  168 |   if (lol1 == ans.length() + 1) ans += ch[0];
      |       ~~~~~^~~~~~~~~~~~~~~~~~~
combo.cpp:169:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  169 |   else if (lol2 == ans.length() + 1) ans += ch[1];
      |            ~~~~~^~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95