Submission #410897

#	Time	Username	Problem	Language	Result	Execution time	Memory
410897		abdzag	Combo (IOI18_combo)	C++17	97 / 100	47 ms	700 KiB

combo

#include<bits/stdc++.h>
#include<unordered_map>
#include "combo.h"
#define rep(i,a,b) for(int i=int(a);i<int(b);i++)
#define rrep(i,a,b) for(int i=int(a);i>int(b);i--)
#define all(v) v.begin(),v.end()
#define trav(a,v) for(auto&a:v)
#define  sz(a) a.size()
typedef long double ld;
using namespace std;
static const long long inf = 1e15;
typedef long long ll;
typedef unsigned long long ull;

string guess_sequence(int N) {
	string p = "";
	string cringe = "";
	vector<string> v = { "A","X","Y","B" };
	rep(i, 0, 3) {
		if (press(v[i])) {
			cringe += v[i];
			v.erase(v.begin() + i);
			p += cringe;
			break;
		}
	}
	if (p == "") {
		cringe += v[3];
		v.erase(v.begin() + 3);
		p += cringe;
	}
	ll cur = 1;
	if (N == 1)return p;
	rep(i, 0, N - 2) {
		string nxt = p;
		nxt += v[0];
		nxt += p + v[1] + v[0];
		nxt += p + v[1] + v[1];
		nxt += p + v[1] + v[2];
		int val = press(nxt);
		if (val == cur + 1) {
			p += v[0];
		}
		else if (val == cur + 2) {
			p += v[1];
		}
		else p += v[2];
		cur++;
	}
	rep(i, 0, 2) {
		string nxt = p + v[i];
		if (press(nxt) == N) {
			p += v[i];
			break;
		}
	}
	if (p.size() != N) {
		p += v[2];
	}
	return p;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:57:15: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   57 |  if (p.size() != N) {
      |      ~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 92 / 95