Submission #530346

#	Time	Username	Problem	Language	Result	Execution time	Memory
530346		DJ035	Combo (IOI18_combo)	C++17	100 / 100	36 ms	652 KiB

combo

#include "combo.h"
#include <vector>
using namespace std;
std::string guess_sequence(int N) {
  string S,st="ABXY";
  int n=N;
  int p=press("AB");
  char f;
  if(!p){
    p=press("X");
    if(p) S += 'X';
    else S += 'Y';
  }
  else {
    p=press("A");
    if(p) S += 'A';
    else S += 'B';
  }
  f = S[0];
  vector<char> h;
  for(int i=0; i<4; i++)
    if(st[i]!=f)
      h.push_back(st[i]);
  for(int i=1; i<n-1; i++){
    string in;
    in += S;
    in += h[1];
    for(int j=0; j<3; j++){
        in += S;
        in += h[0];
        in += h[j];
    }
    p=press(in);
    //cout << S.size() << ' ' << p << '\n';
    if(p==S.size()+2) S += h[0];
    else if(p==S.size()+1) S += h[1];
    else S += h[2];
  }
  if(n==1) return S;
  for(int i=0; i<2; i++){
    p=press(S+h[i]);
    if(p==n)
        return S+h[i];
  }
  return S+h[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:35:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |     if(p==S.size()+2) S += h[0];
      |        ~^~~~~~~~~~~~
combo.cpp:36:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |     else if(p==S.size()+1) S += h[1];
      |             ~^~~~~~~~~~~~

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