Submission #975279

#	Time	Username	Problem	Language	Result	Execution time	Memory
975279		ShaShi	Combo (IOI18_combo)	C++17	5 / 100	1 ms	600 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
#define F first
#define S second
#define pii pair<int, int>
#define all(x) x.begin(), x.end()
#define mp make_pair
#define pb push_back



using namespace std;


typedef long long ll;
typedef long double ld;


const int MAX = (int)2e3 + 7;
const int MOD = 998244353;
const int INF = (int)1e9 + 7;




string guess_sequence(int N) {
	string res, s, op;
	res = "";

	int x = press("AB");

	if (x) {
		x = press("A");

		if (x) res.pb('A');
		else res.pb('B');
	} else {
		x = press("X");

		if (x) res.pb('X');
		else res.pb('Y');
	}

	s = "";

	if (res[0] != 'A') s.pb('A');
	if (res[0] != 'B') s.pb('B');
	if (res[0] != 'X') s.pb('X');
	if (res[0] != 'Y') s.pb('Y');


	while (res.size() != N-1) {
		op.clear();
		op.pb(res[0]); op.pb(s[0]);
		op.pb(res[0]); op.pb(s[1]); op.pb(s[0]);
		op.pb(res[0]); op.pb(s[1]); op.pb(s[1]);
		op.pb(res[0]); op.pb(s[1]); op.pb(s[2]);

		x = press(op);

		if (x == res.size()) {
			res.pb(s[2]);
		} else if (x == res.size()+1) {
			res.pb(s[0]);
		} else {
			res.pb(s[1]);
		}
	}


	res.pb(s[0]);

	x = press(res);

	if (x == N) return res;

	res.pop_back(); res.pb(s[1]);

	x = press(res);

	if (x == N) return res;

	res.pop_back(); res.pb(s[2]);

	return res;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:52:20: 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-1) {
      |         ~~~~~~~~~~~^~~~~~
combo.cpp:61:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |   if (x == res.size()) {
      |       ~~^~~~~~~~~~~~~
combo.cpp:63:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |   } else if (x == res.size()+1) {
      |              ~~^~~~~~~~~~~~~~~

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