Submission #677528

#	Time	Username	Problem	Language	Result	Execution time	Memory
677528		hello_there_123	Combo (IOI18_combo)	C++17	0 / 100	1 ms	208 KiB

combo

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

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:37:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |    if(x == ans.length()) ans+=arr[2];
      |       ~~^~~~~~~~~~~~~~~
combo.cpp:38:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   38 |    else if(x == ans.length() +1) ans += arr[0];
      |            ~~^~~~~~~~~~~~~~~~~~

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