Submission #138491

#	Time	Username	Problem	Language	Result	Execution time	Memory
138491		ckodser	Combo (IOI18_combo)	C++14	5 / 100	2 ms	260 KiB

combo

#include "combo.h"
#include<bits/stdc++.h>
#define ll long long
#define pb push_back
#define ld long double
#define F first
#define S second
#define mp make_pair
#define pii pair<ll,ll> 

using namespace :: std;

const ll maxn=1e5+500;
const ll inf=1e9+900;

const string d[4]={"A","B","X","Y"};
vector<string> t;
string findNext(string s){
    ll res01=press(s+d[0]+s+d[1]);
    ll res02=press(s+d[0]+s+d[2]);
    if(res01>=s.size()+1){
	if(res02>=s.size()+1){
	    return d[0]; 
	}else{
	    return d[1];
	}
    }else{
	if(res02>=s.size()+1){
	    return d[2];
	}else{
	    return d[3];
	}
    }
}
string guess_sequence(int N) {
    string p = findNext("");
    for(ll i=0;i<4;i++){
	if(d[i]!=p){
	    t.pb(d[i]);
	}
    }
    if(press(p)!=1){
	exit(1);
    }
    for(ll i=1;i<N-1;i++){
	ll res=press(p+t[1]+p+t[2]+t[0]+p+t[2]+t[1]+p+t[2]+t[2]);
	if(res==p.size()){
	    p+=t[0];
	}
	if(res==p.size()+1){
	    p+=t[1];
	}
	if(res==p.size()+2){
	    p+=t[2];
	}
    }
    p+=findNext(p);
    return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string findNext(std::string)':
combo.cpp:21:13: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |     if(res01>=s.size()+1){
      |        ~~~~~^~~~~~~~~~~~
combo.cpp:22:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |  if(res02>=s.size()+1){
      |     ~~~~~^~~~~~~~~~~~
combo.cpp:28:10: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   28 |  if(res02>=s.size()+1){
      |     ~~~~~^~~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:47:8: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |  if(res==p.size()){
      |     ~~~^~~~~~~~~~
combo.cpp:50:8: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |  if(res==p.size()+1){
      |     ~~~^~~~~~~~~~~~
combo.cpp:53:8: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |  if(res==p.size()+2){
      |     ~~~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 0 / 95