Submission #76582

#	Time	Username	Problem	Language	Result	Execution time	Memory
76582		Xylofo	Combo (IOI18_combo)	C++14	100 / 100	53 ms	576 KiB

combo

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

string guess_sequence(int N) {
  string toL = "ABXY";
  int fst = 0;
  fst += press("BY") ? 1 : 0;
  fst += press("XY") ? 2 : 0;
  string pre = "";
  pre += toL[fst];
  toL.erase(toL.begin() + fst);
  while(pre.size() + 2 <= N) {
    string query = ""
      + pre + toL[0]
      + pre + toL[1] + toL[0]
      + pre + toL[1] + toL[1]
      + pre + toL[1] + toL[2];
    int k = press(query);
    if(k == pre.size()+0) pre += toL[2];
    if(k == pre.size()+1) pre += toL[0];
    if(k == pre.size()+2) pre += toL[1];
  }
  if(pre.size() != N) {
    string query0 = pre + toL[0];
    string query1 = pre + toL[1];
    string query2 = pre + toL[2];
    if(press(query0) == N) return query0;
    if(press(query1) == N) return query1;
    else                   return query2;
  }
  else {
    return pre;
  }
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:13:24: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   13 |   while(pre.size() + 2 <= N) {
      |         ~~~~~~~~~~~~~~~^~~~
combo.cpp:20:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   20 |     if(k == pre.size()+0) pre += toL[2];
      |        ~~^~~~~~~~~~~~~~~
combo.cpp:21:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     if(k == pre.size()+1) pre += toL[0];
      |        ~~^~~~~~~~~~~~~~~
combo.cpp:22:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |     if(k == pre.size()+2) pre += toL[1];
      |        ~~^~~~~~~~~~~~~~~
combo.cpp:24:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   24 |   if(pre.size() != N) {
      |      ~~~~~~~~~~~^~~~

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