Submission #1236509

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236509		em4ma2	Combo (IOI18_combo)	C++20	Compilation error	0 ms	0 KiB

combo

#include <bits/stdc++.h>
//#include "combo.h"
 
using namespace std;

#define pb push_back
#define ll long long

const int off=1<<19;
const int inf=1e9+4;
const int mxsz=2e5+4;

int q(int x,int y){
    cout<<"? "<<x<<" "<<y<<endl<<flush;
    int xx;
    cin>>xx;
    return xx;
}

void ans(char c){
    cout<<"! "<<c<<endl<<flush;
}

int N=7;
std::string S="ABYXXYB";

constexpr int MAX_N = 2000;
constexpr int MAX_NUM_MOVES = 8000;

int num_moves;

void wrong_answer(const char *MSG) {
  printf("Wrong Answer: %s\n", MSG);
  exit(0);
}

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 p = "XY";
    int x;
    //cout<<p<<endl;
    x=press(p);
    if (x>0){
        p="X";
        x=press(p);
        if (x==0){
            p="Y";
        }
    }else{
        p="A";
        x=press(p);
        if (x==0){
            p="B";
        }
    }
    string chs="ABXY";
    for (int i=0;i<4;i++){
        if (chs[i]==p[0])chs[i]='#';
    }
    string k;
    for (auto x:chs){
        if (x!='#')k.pb(x);
    }
    //cout<<k<<endl;
    int cnt=1;
    int tmp=n-2;
    int j=0;
    while (tmp--){
        string s=p+k[j]
                +p+k[j+1]+k[j]
                +p+k[j+1]+k[j+1]
                +p+k[j+1]+k[j+2];
        //cout<<"DSfj";
        x=press(s);
        //cout<<"DSfj";
        if (x==cnt+0){
            p+=k[j+2];
        }else if (x==cnt+1){
            p+=k[j];
        }else{
            p+=k[j+1];
        }
        cnt++;
    }
    string s=p+k[j]
            +p+k[j+1];
    x=press(s);
    if (x==cnt+1){
        s=p+k[j];
        x=press(s);
        if (x==cnt){
            s=p+k[j+1];
        }
    }else{
        s=p+k[j+2];
    }
    return s;
}

int main(){
    
    int n;
    cin>>n;
    cout<<guess_sequence(n)<<endl;
    

    return 0;
}

Compilation message (stderr)

/usr/bin/ld: /tmp/ccpvJly5.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/ccHBOVdN.o:combo.cpp:(.text+0x230): first defined here
/usr/bin/ld: /tmp/ccpvJly5.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccHBOVdN.o:combo.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status