Submission #542654

#	Time	Username	Problem	Language	Result	Execution time	Memory
542654		RaresFelix	Combo (IOI18_combo)	C++17	100 / 100	32 ms	576 KiB

combo

#include "combo.h"
using namespace std;
#include <set>

std::string guess_sequence(int N) {
  string incep_char;
  if(press("AB")) incep_char = press("A") ? "A" : "B";
  else incep_char = press("X") ? "X" : "Y";
  string cguess = incep_char;
  if(N == 1) return incep_char;
  set<string> Posib{"A", "B", "X", "Y"};
  Posib.erase(incep_char);
  string A, B, C;
  A = *Posib.begin(); Posib.erase(A);
  B = *Posib.begin(); Posib.erase(B);
  C = *Posib.begin(); Posib.erase(C);
  for(int i = 1; i < N - 1; ++i) {
      int rasp = press(cguess + A + A + cguess + A + B + cguess + A + C + cguess + B);
      if(rasp == cguess.size() + 2) cguess += A;
      else if(rasp == cguess.size() + 1) cguess += B;
      else cguess += C;
  }
  if(press(cguess + A) == N) return cguess + A;
  if(press(cguess + B) == N) return cguess + B;
  return cguess + C;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:19:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |       if(rasp == cguess.size() + 2) cguess += A;
      |          ~~~~~^~~~~~~~~~~~~~~~~~~~
combo.cpp:20:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |       else if(rasp == cguess.size() + 1) cguess += B;
      |               ~~~~~^~~~~~~~~~~~~~~~~~~~

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