Submission #491338

#	Time	Username	Problem	Language	Result	Execution time	Memory
491338		cosmic	Combo (IOI18_combo)	C++14	Compilation error	0 ms	0 KiB

combo

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

char buttons[4]={'A','B','X','Y'};
char firstch;
char next(char w){
    int first=-1;
    for(int i=0;i<4;i++){
        if(buttons[i]==firstch) first=i;
    }
    return next((first+w)%4);
}
std::string guess_sequence(int N) {
 /* std::string p = "";
  for (int i = 0; i < 4 * N; ++i) {
    p += 'A';
  }
  int coins = press(p);
  std::string S = "";
  for (int i = 0; i < N; ++i) {
    S += 'A';
  }*/
  string s=" ";
  if(press("AB")>=1){
    if(press("A")==1){
        s+="A";
    }else s+="B";
  }else{
    if(press("X")==1) s+="X";
    else s+="Y";
  }
  firstch=s[0];
  while((int)s.size()<N-1){
    string quer=s+next(1);
    quer+=s+next(2)+next(1);
    quer+=s+next(2)+next(2);
    quer+=s+next(2)+next(3);
    int x=press(quer);
    if(x==s.size()+1) s+=next(3);
    else if(x==s.size()+2) s+=next(1);
    else s+=next(2);
  }
    if(press(s+next(1))==N) s+=next(1);
    else if(press(s+next(2))==N) s+=next(2);
    else s+=next(3);
  return N;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:40:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   40 |     if(x==s.size()+1) s+=next(3);
      |        ~^~~~~~~~~~~~
combo.cpp:41:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     else if(x==s.size()+2) s+=next(1);
      |             ~^~~~~~~~~~~~
combo.cpp:47:10: error: could not convert 'N' from 'int' to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   47 |   return N;
      |          ^
      |          |
      |          int