Submission #377713

#	Time	Username	Problem	Language	Result	Execution time	Memory
377713		practice101	Combo (IOI18_combo)	C++14	100 / 100	44 ms	568 KiB

combo

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

string guess_sequence(int N) {
  string p = "";
  char a = 'A' , b = 'B' , x = 'X' , y = 'Y';


    p += a ;
    p += b;
    int coins = press(p);
    string S = "";
  if(coins){
    p = "" ;
     p += a ;

    coins = press(p);
    if(!coins)swap(a , b) , p = " " , p += a ;


  }
  else {
    p = "" ;
    p += x ;

    coins = press(p);
    if(coins)swap(a , x) ;
    else swap(y , a) , p = "" , p += a ;

  }
    S.push_back(a);
    int past = 1 ;

  while(1){
    if(S.size() == N)return S ;
    if(S.size() == N - 1){

        S += b ;
        if(press(S) == N)return S ;
        S.pop_back();
        S += x ;
        if(press(S) == N)return S ;
        S.pop_back();
        S += y ;

        return S ;

    }
    p = S ;
    p += b ;
    p += b ;
    p += S ;
    p += b ;
    p += x ;
    p += S ;
    p += b ;
    p += y ;
    p += S ;
    p += x ;



    coins = press(p);
    if(coins == past){
        S += y ;

    }
    else {
        if(coins - 1 == past)
            S += x ;
        else S += b ;

    }
    past ++ ;


  }



  return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:36:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   36 |     if(S.size() == N)return S ;
      |        ~~~~~~~~~^~~~
combo.cpp:37:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   37 |     if(S.size() == N - 1){
      |        ~~~~~~~~~^~~~~~~~

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