Submission #677505

#	Time	Username	Problem	Language	Result	Execution time	Memory
677505		hello_there_123	Combo (IOI18_combo)	C++17	0 / 100	1 ms	432 KiB

combo

#include<bits/stdc++.h>
//#include "combo.h"
using namespace std;
string arr[4]={"A","B","X","Y"};
set<string>st;
int press(string s);
string guess_sequence(int N){
  	if(N==1){
		for(int i=0;i<4;i++){
			if(press(arr[i]) == 1) return arr[i];
        }
      assert(1==0);
    }
	string ans = "";
	string start = "";
	st.insert("A");
	st.insert("B");
	st.insert("X");
	st.insert("Y");
  	for(int i=0;i<4;i++){
		string tr = "";
      	for(int j=0;j<4;j++){
        	tr = tr+arr[i]+arr[j];
		}		
      if(press(tr) == 2){
      	start = arr[i];
        break;
      }
      }
	st.erase(start);
	vector<string>v;
	for(auto str:st) v.push_back(str);
	ans+=start;
	for(int i=0;i<N-2;i++){
		string tr = "";
		tr+=ans;
		tr+=v[0];
		tr+=ans;
		tr+=v[1];
		tr+=v[0];
		tr+=ans;
		tr+=v[1];
		tr+=v[1];
		tr+=ans;
		tr+=v[1];
		tr+=v[2];
      	int x = press(tr);
		if(x == ans.length()){
			ans+=v[2];
		}
		else if(x == ans.length()+1){
			ans+=v[0];
		}
		else ans+=v[1];
	}
 	assert(ans.length() == N-1);
	if(press(ans+v[0]) == N) return ans+v[0];
	if(press(ans+v[1]) == N) return ans+v[1];
	if(press(ans+v[2])==N) return ans+v[2];
  	assert(1);
 
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:48:8: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |   if(x == ans.length()){
      |      ~~^~~~~~~~~~~~~~~
combo.cpp:51:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |   else if(x == ans.length()+1){
      |           ~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/10/cassert:44,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:33,
                 from combo.cpp:1:
combo.cpp:56:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   56 |   assert(ans.length() == N-1);
      |          ~~~~~~~~~~~~~^~~~~~
combo.cpp:14:15: warning: control reaches end of non-void function [-Wreturn-type]
   14 |  string ans = "";
      |               ^~

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