Submission #1206300

#	Time	Username	Problem	Language	Result	Execution time	Memory
1206300		adiat	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include<bits/stdc++.h>
//#include"combo.h"
using namespace std;
int press(string s);
string guess_sequence(int N)
{
	string ans;
	int k=0;
	int q=press("AB");
	if(q==1)
	{
		if(press("A")==1)
			ans+='A';
		else ans+='B';
	}
	else if(q==2)
	{
		ans+="AB";
		k+=1;
	}
	else if(press("X")==1)
	{
		ans+="X";
	}
	else ans+="Y";
	k+=1;
	string s;
	for(char i: {'A', 'B','X','Y'})
	{
		if(i!=ans[0])
			s+=i;
	}
//	cout<<s<<endl;
	while(k<N-1)
	{
		q=press(ans+s[0]+ans+s[1]+s[0]+ans+s[1]+s[1]+ans+s[1]+s[2]);
		if(q==k+1)
			ans+=s[0];
		else if(q==k+2)
			ans+=s[1];
		else ans+=s[2];
		k++;
	}
	q=press(ans+s[0]+ans+s[1]);
	if(q==k+1)
	{
		if(press(ans+s[0])==k+1)
			return ans+s[0];
		else return ans+s[1];
	}
	else return ans+s[2];
}
#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() {
  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);
  cout<<answer<<endl;
  if (answer != S) {
    wrong_answer("wrong guess");
    exit(0);
  }
  printf("Accepted: %d\n", num_moves);
  return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccXQqxQo.o: in function `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)':
grader.cpp:(.text+0x0): multiple definition of `press(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >)'; /tmp/cckFGs3m.o:combo.cpp:(.text+0x50): first defined here
/usr/bin/ld: /tmp/ccXQqxQo.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cckFGs3m.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status