Submission #795652

#	Time	Username	Problem	Language	Result	Execution time	Memory
795652		NothingXD	Combo (IOI18_combo)	C++17	100 / 100	30 ms	648 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;
typedef double ld;
typedef complex<ld> point;

void debug_out(){cerr << endl;}

template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
	cerr << H << ' ';
	debug_out(T...);
}

#define debug(...) cerr << "(" << #__VA_ARGS__ << "): ", debug_out(__VA_ARGS__)
#define F first
#define S second
#define all(x) x.begin(), x.end()
#define MP(x, y) make_pair(x, y)

const int maxn = 2e3 + 10;

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int n, ptr[maxn];
vector<string> val[maxn];

std::string guess_sequence(int N) {
	n = N;
	vector<string> av = {"A", "B", "X", "Y"};
	string res;
	if (press(av[0]+av[1])){
		if (press(av[0])){
			res = av[0];
			av.erase(av.begin());
		}
		else{
			res = av[1];
			av.erase(av.begin()+1);
		}
	}
	else{
		if (press(av[2])){

			res = av[2];
			av.erase(av.begin()+2);
		}
		else{

			res = av[3];
			av.erase(av.begin()+3);
		}	
	}
	if (n == 1) return res;
	for (int i = 1; i < n-1; i++){
		string ask = res;
		ask += av[0];
		ask += res;
		ask += av[1];
		ask += av[0];

		ask += res;
		ask += av[1];
		ask += av[1];

		ask += res;
		ask += av[1];
		ask += av[2];
		int tmp = press(ask);
		if (tmp == i){
			res += av[2];
		}
		else if (tmp == i+1){
			res += av[0];
		}
		else{
			res += av[1];
		}
	}
	for (int i = 0; i < 2; i++){
		string ask = res + av[i];
		if (press(ask) == n){
			res += av[i];
			break;
		}
	}
	if (res.size() == n-1) res += av[2];
	return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:92:17: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   92 |  if (res.size() == n-1) res += av[2];
      |      ~~~~~~~~~~~^~~~~~

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