Submission #699208

#	Time	Username	Problem	Language	Result	Execution time	Memory
699208		Baytoro	Combo (IOI18_combo)	C++17	100 / 100	39 ms	592 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
#define ios ios::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL);
#define pb push_back
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define fr first
#define sc second
#define endl '\n'
//#define int long long
//#define ll long long
void fopn(string name){
	freopen((name+".in").c_str(),"r",stdin);
	freopen((name+".out").c_str(),"w",stdout);
}

const long long INF=1e18,mod=1e9+7;
string guess_sequence(int n) {
	string ans,a="A",b="B",c="X",d="Y";
	int s=press(a+b);
	if(s>=1){
		if(press(b)==1)
			swap(a,b);
	}
	else{
		if(press(c))
			swap(a,c);
		else
			swap(a,d);
	}
	ans=a;
	for(int i=1;i<n-1;i++){
		int k=press(ans+b+ans+c+b+ans+c+c+ans+c+d);
		if(k==(int)ans.size()+1) ans=ans+b;
		else if(k==(int)ans.size()+2) ans=ans+c;
		else ans=ans+d;
	}
	if(n>1){
		s=press(ans+b+ans+c);
		if(s==n){
			if(press(ans+b)==n)	
				ans=ans+b;
			else
				ans=ans+c;
		}
		else
			ans=ans+d;
	}
	return ans;
}

Compilation message (stderr)

combo.cpp: In function 'void fopn(std::string)':
combo.cpp:14:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  freopen((name+".in").c_str(),"r",stdin);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
combo.cpp:15:9: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  freopen((name+".out").c_str(),"w",stdout);
      |  ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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