Submission #398815

#	Time	Username	Problem	Language	Result	Execution time	Memory
398815		mshandilya	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
std::string guess_sequence(int N) {
  std::string S, p, query;
  std::vector<char> knownstr;
  char start;
  int preknown = 0, score;
  while(preknown<n) {
    string p(knownstr.begin(), knownstr.end());
    if(preknown==0) {
      score = press("AB");
      if(score){
        score = press("A");
        if(score)
          start = 'A';
        else
          start = 'B';
      }
      else{
        score = press("X");
        if(score)
          start = 'X';
        else
          start = 'Y';
      }
      knownstr.push_back(start);
      preknown++;
    }
    else if(preknown==N-1) {
      query = p + "AB";
      score = press(query);
      if(score==preknown+1) {
        score = press(p + "A");
        if(score==preknown+1)
          knownstr.push_back('A');
        else
          knownstr.push_back('B');
      }
      else {
        score = press(p + "X");
        if(score==preknown+1)
          knownstr.push_back('X');
        else
          knownstr.push_back('Y');
      }
      preknown++;
    }
    else {
      switch(start) {
        case 'A':
        query = p + "BB" + p + "BX" + p + "BY" + p + "X";
        score = press(query);
        if(score==preknown+2)
          knownstr.push_back('B');
        else if(score==preknown+1)
          knownstr.push_back('X');
        else
          knownstr.push_back('Y');
        break;
        case 'B':
        query = p + "AA" + p + "AX" + p + "AY" + p + "X";
        score = press(query);
        if(score==preknown+2)
          knownstr.push_back('A');
        else if(score==preknown+1)
          knownstr.push_back('X');
        else
          knownstr.push_back('Y');
        break;
        case 'X':
        query = p + "AA" + p + "AB" + p + "AY" + p + "B";
        score = press(query);
        if(score==preknown+2)
          knownstr.push_back('A');
        else if(score==preknown+1)
          knownstr.push_back('B');
        else
          knownstr.push_back('Y');
        break;
        case 'Y':
        query = p + "AA" + p + "AB" + p + "AX" + p + "B";
        score = press(query);
        if(score==preknown+2)
          knownstr.push_back('A');
        else if(score==preknown+1)
          knownstr.push_back('B');
        else
          knownstr.push_back('X');
        break;
      }
      preknown++;
    }
  }
  string S(knownstr.begin(), knownstr.end());
  return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:8:18: error: 'n' was not declared in this scope
    8 |   while(preknown<n) {
      |                  ^
combo.cpp:9:5: error: 'string' was not declared in this scope; did you mean 'std::string'?
    9 |     string p(knownstr.begin(), knownstr.end());
      |     ^~~~~~
      |     std::string
In file included from /usr/include/c++/10/string:39,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/bits/stringfwd.h:79:33: note: 'std::string' declared here
   79 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
combo.cpp:94:3: error: 'string' was not declared in this scope; did you mean 'std::string'?
   94 |   string S(knownstr.begin(), knownstr.end());
      |   ^~~~~~
      |   std::string
In file included from /usr/include/c++/10/string:39,
                 from combo.h:3,
                 from combo.cpp:1:
/usr/include/c++/10/bits/stringfwd.h:79:33: note: 'std::string' declared here
   79 |   typedef basic_string<char>    string;
      |                                 ^~~~~~