Submission #75440

#	Time	Username	Problem	Language	Result	Execution time	Memory
75440		Vardanyan	Combo (IOI18_combo)	C++14	100 / 100	50 ms	564 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;
string guess_sequence(int N) {
    string ans = "";
    vector<string> v;
    if(press("AB") >= 1){
      if(press("A") == 1){      ans+="A";
            v.push_back("B"); v.push_back("X"); v.push_back("Y");
      }
        else  {
        ans+="B";
            v.push_back("A"); v.push_back("X"); v.push_back("Y");
        }
    }
  else{ if(press("X") == 1){
        ans+="X";
            v.push_back("B"); v.push_back("A"); v.push_back("Y");
  }
  else {
        ans+="Y";
            v.push_back("B"); v.push_back("X"); v.push_back("A");
  }
  }
  while(ans.length()+2<=N){
    string p = ans+v[0]+ans+v[1]+v[0]+ans+v[1]+v[1]+ans+v[1]+v[2];
    int k = press(p);
    if(k-ans.length() == 1) ans+=v[0];
    else if(k-ans.length() == 2) ans+=v[1];
    else if(k-ans.length() == 0) ans+=v[2];
  }
  if(ans.length() == N) return ans;
  if(press(ans+v[0]) == N) return ans+v[0];
  if(press(ans+v[1]) == N) return ans+v[1];
  return ans+v[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:25:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   25 |   while(ans.length()+2<=N){
      |         ~~~~~~~~~~~~~~^~~
combo.cpp:32:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   32 |   if(ans.length() == N) return ans;
      |      ~~~~~~~~~~~~~^~~~

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