Submission #241864

#	Time	Username	Problem	Language	Result	Execution time	Memory
241864		syy	Combo (IOI18_combo)	C++17	100 / 100	39 ms	668 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define FOR(i, a, b) for(int i = (int)a; i <= (int)b; i++)
#define DEC(i, a, b) for(int i = (int)a; i >= (int)b; i--)
typedef pair<int, int> pi;
typedef pair<int, pi> pii;
typedef pair<pi, pi> pipi;
#define f first
#define s second
typedef vector<int> vi;
typedef vector<pi> vpi;
typedef vector<pii> vpii;
#define pb push_back
#define pf push_front
#define all(v) v.begin(), v.end()
#define disc(v) sort(all(v)); v.resize(unique(all(v)) - v.begin());
#define INF (int) 1e9 + 100
#define LLINF (ll) 1e18
#define fastio ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

string s;
vector<string> str;

string guess_sequence(int n) {
	if (press("AB")) {
		if (press("A")) s = "A";
		else s = "B";
	} else {
		if (press("X")) s = "X";
		else s = "Y";
	}
	if (s == "A") str = {"B", "XB", "XX", "XY"};
	else if (s == "B") str = {"A", "XA", "XX", "XY"};
	else if (s == "X") str = {"A", "BA", "BB", "BY"};
	else str = {"A", "BA", "BB", "BX"};
	FOR(i, 1, n-2) {
		int res = press(s + str[0] + s + str[1] + s + str[2] + s + str[3]);
		if (res == s.length()) s += str[3][1];
		else if (res == s.length() + 1) s += str[0];
		else s += str[1][0];
	}
	if (n >= 2) {
		if (press(s + "A" + s + "B") > s.length()) {
			if (press(s + "A") > s.length()) s += "A";
			else s += "B";
		} else {
			if (press(s + "X") > s.length()) s += "X";
			else s += "Y";
		}
	}
	return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:41:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |   if (res == s.length()) s += str[3][1];
      |       ~~~~^~~~~~~~~~~~~
combo.cpp:42:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   42 |   else if (res == s.length() + 1) s += str[0];
      |            ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:46:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |   if (press(s + "A" + s + "B") > s.length()) {
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
combo.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |    if (press(s + "A") > s.length()) s += "A";
      |        ~~~~~~~~~~~~~~~^~~~~~~~~~~~
combo.cpp:50:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |    if (press(s + "X") > s.length()) s += "X";
      |        ~~~~~~~~~~~~~~~^~~~~~~~~~~~

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