Submission #1081255

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081255		logangd	Combo (IOI18_combo)	C++14	100 / 100	26 ms	1756 KiB

combo

#include "combo.h"
using namespace std;

string guess_sequence(int N){
    char c[3];
    string s;
    int t=press("AB");
    if(t){
        t=press("A");
        if(t)c[0]='B',c[1]='X',c[2]='Y',s+="A";
        else c[0]='A',c[1]='X',c[2]='Y',s+="B";
    }else{
        t=press("X");
        if(t)c[0]='B',c[1]='A',c[2]='Y',s+="X";
        else c[0]='B',c[1]='X',c[2]='A',s+="Y";
    }
    if(N==1)return s;
    while(s.size()<N-1){
        t=press(s+c[0]+c[0]+s+c[0]+c[1]+s+c[0]+c[2]+s+c[1]);
        if(t==s.size()){
            s+=c[2];
        }else if(t==s.size()+1){
            s+=c[1];
        }else{
            s+=c[0];
        }
    }
    t=press(s+"A"+s+"B");
    if(t==s.size()+1){
        t=press(s+"A");
        if(t==s.size()+1)s+="A";
        else s+="B";
    }else{
        t=press(s+"X");
        if(t==s.size()+1)s+="X";
        else s+="Y";
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |     while(s.size()<N-1){
      |           ~~~~~~~~^~~~
combo.cpp:20:13: 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(t==s.size()){
      |            ~^~~~~~~~~~
combo.cpp:22:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         }else if(t==s.size()+1){
      |                  ~^~~~~~~~~~~~
combo.cpp:29:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   29 |     if(t==s.size()+1){
      |        ~^~~~~~~~~~~~
combo.cpp:31:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   31 |         if(t==s.size()+1)s+="A";
      |            ~^~~~~~~~~~~~
combo.cpp:35:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if(t==s.size()+1)s+="X";
      |            ~^~~~~~~~~~~~

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