Submission #346444

#	Time	Username	Problem	Language	Result	Execution time	Memory
346444		lebasivillar	Combo (IOI18_combo)	C++14	100 / 100	41 ms	552 KiB

combo

#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string>
#include <vector>
#include "combo.h"
using namespace std;

string guess_sequence(int N){
  string t;
  if (press("AB") > 0){
    if (press("A") > 0) t.push_back('A');
    else t.push_back('B');
  }
  else {
    if (press("X") > 0) t.push_back('X');
    else t.push_back('Y');
  }
  if (N == 1) return t;
  string sequence = "ABXY";
  vector <string> left;
  for (int i = 0; i < sequence.size(); ++i){
    if (sequence[i] != t[0]) {
      string word;
      word.push_back(sequence[i]);
      left.push_back(word);
    }
  }
  vector <string> ends = {left[1], left[2] + left[0], left[2] + left[1], left[2]+ left[2]};
  while (t.size() < N - 1){
    int value = press(t + ends[0] + t + ends[1] + t + ends[2] + t + ends[3]) -t.size();
    if (value == 0) t += left[0];
    if (value == 1) t += left[1];
    if (value == 2) t += left[2];
  }
  if (press(t + left[0]) == N) t += left[0];
  else if (press(t + left[1]) == N) t += left[1];
  else t += left[2];
  return t;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:22:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   for (int i = 0; i < sequence.size(); ++i){
      |                   ~~^~~~~~~~~~~~~~~~~
combo.cpp:30:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |   while (t.size() < N - 1){
      |          ~~~~~~~~~^~~~~~~

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