Submission #1279774

#	Time	Username	Problem	Language	Result	Execution time	Memory
1279774		tull	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
std::string guess_sequence(int N) {
  int p=0,r;
  char c[]={'A','B','X','Y'};
  char sk,nt;
  string a="";
  for(int i=0;i<4;++i){
    char e=c[i];
    //nt=c[(i==3?0:i+1)];
    r=press(a+e);
      if(r>p){
        a+=e;
        if(r-p==2){
          a+=nt;
          ++p;
          nt='-';
        }
        ++p;
        sk=e;
        break;
    }
  }
  while (p<N)
  {
    for(int i=0;i<4;++i){
      char e=c[i];
      if(e==sk or e==nt)continue;
      if(i!=3 and N-p>1)r=press(a+e+e);
      else if(i!=3 and N-p==1)r=press(a+e);
      else r=p+1;
      char nt=c[(i==3?0:i+1)];
      if(r>p){
        a+=e;
        if(r-p==2){
          a+=nt;
          ++p;
          nt='-';
        }else{
          nt=e;
        }
        ++p;
        break;
      }
    }
  }
  
  return a;
}

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

Compilation message (stderr)

/usr/bin/ld: /tmp/ccvFlHog.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/ccW6XQEw.o:combo.cpp:(.text+0x30): first defined here
/usr/bin/ld: /tmp/ccvFlHog.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccW6XQEw.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status