Submission #549461

#	Time	Username	Problem	Language	Result	Execution time	Memory
549461		esomer	Combo (IOI18_combo)	C++17	100 / 100	30 ms	564 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

string guess_sequence(int N) {
  string ans = "";
  vector<string> pos;
  int x = press("XY"); //
  if(x == 2) {ans = "XY"; pos = {"Y", "A", "B"};}
  else if(x == 1){
    x = press("X"); //
    if(x) {ans = "X"; pos = {"Y", "A", "B"};}
    else {ans = "Y";  pos = {"X", "A", "B"};}
  }else{
    x = press("A"); //
    if(x) {ans = "A";  pos = {"Y", "X", "B"};}
    else {ans = "B";  pos = {"Y", "A", "X"};}
  }
  while(ans.size() + 2 <= N){
    ans += pos[0];
    ans += pos[1];
    string ss = ans;
    ans.pop_back();
    ans += pos[0];
    ss += ans;
    ans.pop_back();
    ans.pop_back();
    ans += pos[1];
    ans += pos[1];
    ss += ans;
    x = press(ss); //
    ans.pop_back();
    ans.pop_back();
    if(x == ans.size() + 2){
      ans += pos[0];
      ans += pos[0];
      x = press(ans); //
      ans.pop_back();
      ans.pop_back();
      if(x == ans.size() + 1){
        ans += pos[0];
        ans += pos[1];
      }else if(x == ans.size()){
        ans += pos[1];
        ans += pos[1];
      }else{
        ans += pos[0];
        ans += pos[0];
      }
    }else if(x == ans.size() + 1){
      ans += pos[1];
      ans += pos[2];
      x = press(ans); //
      ans.pop_back();
      ans.pop_back();
      if(x == ans.size() + 1){
        ans += pos[1];
        ans += pos[0];
      }else if(x == ans.size()){
        ans += pos[0];
        ans += pos[2];
      }else{
        ans += pos[1];
        ans += pos[2];
      }
    }else ans += pos[2];
  }
  if(ans.size() == N) return ans;
  else{
    ans += pos[0];
    x = press(ans); //
    if(x == N) return ans;
    else{
      ans.pop_back();
      ans += pos[1];
      x = press(ans); //
      if(x == N) return ans;
      else{
        ans.pop_back();
        ans += pos[2];
        return ans;
      }
    }
  }
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |   while(ans.size() + 2 <= N){
      |         ~~~~~~~~~~~~~~~^~~~
combo.cpp:35:10: 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(x == ans.size() + 2){
      |        ~~^~~~~~~~~~~~~~~~~
combo.cpp:41:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |       if(x == ans.size() + 1){
      |          ~~^~~~~~~~~~~~~~~~~
combo.cpp:44:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |       }else if(x == ans.size()){
      |                ~~^~~~~~~~~~~~~
combo.cpp:51:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |     }else if(x == ans.size() + 1){
      |              ~~^~~~~~~~~~~~~~~~~
combo.cpp:57:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   57 |       if(x == ans.size() + 1){
      |          ~~^~~~~~~~~~~~~~~~~
combo.cpp:60:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |       }else if(x == ans.size()){
      |                ~~^~~~~~~~~~~~~
combo.cpp:69:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   69 |   if(ans.size() == N) return ans;
      |      ~~~~~~~~~~~^~~~

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