Submission #486468

#	Time	Username	Problem	Language	Result	Execution time	Memory
486468		ssense	Combo (IOI18_combo)	C++14	100 / 100	37 ms	580 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
#define startt ios_base::sync_with_stdio(false);cin.tie(0);
typedef long long  ll;
using namespace std;
#define vint vector<int>
#define all(v) v.begin(), v.end()
#define MOD 1000000007
#define MOD2 998244353
#define MX 1000000000
#define MXL 1000000000000000000
#define PI (ld)2*acos(0.0)
#define nax 200005
#define pb push_back
#define sc second
#define fr first
//#define int long long
#define endl '\n'
#define ld long double
#define NO cout << "NO" << endl
#define YES cout << "YES" << endl
/*
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;
}
*/
string guess_sequence(int n)
{
	string s;
	vector<char> a(4);
	a[0] = 'A'; a[1] = 'B'; a[2] = 'X'; a[3] = 'Y';
	int k;
	char exclude;
	if(press("AB") >= 1)
	{
		if(press("A") >= 1)
		{
			exclude = 'A';
		}
		else
		{
			exclude = 'B';
		}
	}
	else
	{
		if(press("X") >= 1)
		{
			exclude = 'X';
		}
		else
		{
			exclude = 'Y';
		}
	}
	s.pb(exclude);
	a.erase(find(all(a), exclude));
	for(int i = 0; i < n-2; i++)
	{
		string now = s;
		now+=a[0];
		now+=a[0];
		now+=s;
		now+=a[0];
		now+=a[1];
		now+=s;
		now+=a[0];
		now+=a[2];
		now+=s;
		now+=a[1];
		k = press(now);
		if(k == s.size()+2)
		{
			s.pb(a[0]);
			continue;
		}
		if(k == s.size()+1)
		{
			s.pb(a[1]);
			continue;
		}
		if(k == s.size())
		{
			s.pb(a[2]);
		}
	}
	if(s.size() < n)
	{
		if(press(s+a[0]) == s.size()+1)
		{
			s+=a[0];
		}
		else if(press(s+a[1]) == s.size()+1)
		{
			s+=a[1];
		}
		else
		{
			s+=a[2];
		}
	}
	return s;
}

/*
int main() {
	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) {
		wrong_answer("wrong guess");
		exit(0);
	  }
	  printf("Accepted: %d\n", num_moves);
	  return 0;
  return 0;
}
*/

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:112:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  112 |   if(k == s.size()+2)
      |      ~~^~~~~~~~~~~~~
combo.cpp:117:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  117 |   if(k == s.size()+1)
      |      ~~^~~~~~~~~~~~~
combo.cpp:122:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  122 |   if(k == s.size())
      |      ~~^~~~~~~~~~~
combo.cpp:127:14: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
  127 |  if(s.size() < n)
      |     ~~~~~~~~~^~~
combo.cpp:129:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  129 |   if(press(s+a[0]) == s.size()+1)
      |      ~~~~~~~~~~~~~~^~~~~~~~~~~~~
combo.cpp:133:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |   else if(press(s+a[1]) == s.size()+1)
      |           ~~~~~~~~~~~~~~^~~~~~~~~~~~~

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