Submission #792851

#	Time	Username	Problem	Language	Result	Execution time	Memory
792851		NothingXD	Combo (IOI18_combo)	C++17	30 / 100	37 ms	856 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;
	for (int i = 0; i < 3; i++){
		int tmp = press(av[i]);
		if (tmp == 1){
			res = av[i];
			av.erase(av.begin()+i);
		}
	}
	if (res.empty()){
		res = av[3];
		av.pop_back();
	}
	for (int i = 1; i < n; i++){
		val[i] = av;
		shuffle(all(val[i]), rng);
	}
	while(res.size() < n){
		string ask = res;
		for (int j = res.size(); j < n; j++){
			ask += val[j][ptr[j]];
		}
		int tmp = press(ask);
		res = ask.substr(0, tmp);
		ptr[tmp]++;
	}
	return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:52:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |  while(res.size() < n){
      |        ~~~~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95