Submission #216745

#	Time	Username	Problem	Language	Result	Execution time	Memory
216745		tushar_2658	Combo (IOI18_combo)	C++14	97 / 100	40 ms	672 KiB

combo

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

string guess_sequence(int N) {
  string s;
  if(press("A") == 1){
    s = "A";
  }else if(press("B")){
    s = "B";
  }else if(press("X")){
    s = "X";
  }else {
    s = "Y";
  }
  if(N == 1)return s;
  string ss = "ABXY";
  for(int i = 0; i < 4; i++){
    if(ss[i] == s[0]){
      ss.erase(i, 1);
      break;
    }
  }
  string c;
  c += ss.back();
  ss.pop_back();
  for(int i = 1; i < N - 1; i++){
    string q = s + ss + s + ss[0] + ss[0] + s + ss[0] + c + s + ss[1];
    int n = press(q);
    if(n == s.size()){
      s += c;
    }else if(n == s.size() + 2){
      s += ss[0];
    }else {
      s += ss[1];
    }
  }
  if(press(s + ss[0]) == s.size() + 1){
    s += ss[0];
  }else if(press(s + ss[1]) == s.size() + 1){
    s += ss[1];
  }else {
    s += c;
  }
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:30:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   30 |     if(n == s.size()){
      |        ~~^~~~~~~~~~~
combo.cpp:32:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |     }else if(n == s.size() + 2){
      |              ~~^~~~~~~~~~~~~~~
combo.cpp:38:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |   if(press(s + ss[0]) == s.size() + 1){
      |      ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:40:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |   }else if(press(s + ss[1]) == s.size() + 1){
      |            ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95