Submission #156275

#	Time	Username	Problem	Language	Result	Execution time	Memory
156275		a_player	Combo (IOI18_combo)	C++14	97 / 100	62 ms	600 KiB

combo

#include <bits/stdc++.h>

#define f first
#define s second
#define mp make_pair
#define pb push_back

using namespace std;
typedef long long ll;
int press(string p);
string c[4];
vector<string> v;
string guess_sequence(int N){
	string s="";
	 c[0]="A";
	 c[1]="B";
	 c[2]="X";
	 c[3]="Y";
	 int pos=-1;
	 for(int i=0;i<3;i++){
		 int a=press(c[i]);
		 if(a==1){
			 s+=c[i];
			 pos=i;
			 break;
			 }
		 }
		 if(pos==-1){
			 s+=c[3];
			 pos=3;
			 }
		 for(int i=0;i<4;i++)if(pos!=i)v.push_back(c[i]);
		for(int i=1;i<N-1;i++){
			stringstream ss;
			ss<<s<<v[0]<<s<<v[1]<<v[0]<<s<<v[1]<<v[1]<<s<<v[1]<<v[2];
			int a=press(ss.str());
			if(a==(int)s.size()+1)s+=v[0];
			else if(a==(int)s.size()+2)s+=v[1];
			else s+=v[2];
			}
            if(N>1){
            int a=press(s+v[0]);
            if(a==s.size()+1)return s+v[0];
            a=press(s+v[1]);
  			if(a==s.size()+1)return s+v[1];
			return s+v[2];}
  return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:43:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |             if(a==s.size()+1)return s+v[0];
      |                ~^~~~~~~~~~~~
combo.cpp:45:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |      if(a==s.size()+1)return s+v[1];
      |         ~^~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95