Submission #1215109

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215109		lizi14	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

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

using namespace std;

string guess_sequence(int N) {
    int d[4]={0,0,0,0};
    char p[4]={'A','B','X','Y'};
    string s_1,s_2,s_3,s_4;
    string sa="";
    int coins = press("AB");
    if(coins==1){
        coins=press("A");
        if(coins==1){
            d[0]=1;
            sa+="A";
        }
        else{
            d[1]=1;
            sa+="B";
        }
    }
    else{
        coins=press("X");
        if(coins==1){
            d[2]=1;
            sa+="X";
        }
        else{
            d[3]=1;
            sa+="Y";
        }
    }
    if(d[3]==1){
        s_1="A";
        s_2="BA";
        s_3="BB";
        s_4="BX";
    }
    else if(d[2]==1){
        s_1="A";
        s_2="BA";
        s_3="BB";
        s_4="BY";
    }
    else if(d[0]==1){
        s_1="B";
        s_2="XB";
        s_3="XX";
        s_4="XY";
    }
    else{
        s_1="A";
        s_2="XA";
        s_3="XX";
        s_4="XY";
    }
    while(sa.size()<N-1){
        string w="";
        for(int i=1; i<=4; i++){
            w+=sa;
            if(i%4==1){
                w+=s_1;
            }
            else if(i%4==2){
                w+=s_2;
            }
            else if(i%4==3){
                w+=s_3;
            }
            else w+=s_4;
        }
        coins=press(w);
        if(coins==sa.size()+1){
            sa+=s_1[0];
        }
        else if(coins==sa.size()){
            sa+=s_4[1];
        }
        else sa+=s_2[0];
    }
    int k=0;
    for(int i=0; i<4; i++){
        if(k==2)break;
        if(d[i]==0){
            string w=sa;
            w+=p[i];
            coins=press(w);
            k++;
            if(coins==N){
                sa+=p[i];
                return sa;
            }
            else d[i]=1;
        }
    }
    for(int i=0; i<4; i++){
            if(d[i]==0){
            sa+=p[i];
        }
    }
    
    
    return sa;
}

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

Compilation message (stderr)

/usr/bin/ld: /tmp/ccyWBHuc.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/cc9423Qt.o:combo.cpp:(.text+0x30): first defined here
/usr/bin/ld: /tmp/ccyWBHuc.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc9423Qt.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status