Submission #139645

#	Time	Username	Problem	Language	Result	Execution time	Memory
139645		bazsi700	Combo (IOI18_combo)	C++14	5 / 100	2 ms	268 KiB

combo

#include <bits/stdc++.h>
#include "combo.h"
using namespace std;

#define MOD 1000000007
#define ll long long int
#define vi vector<int>
#define vii vector< vector<int> >
#define PI 3.1415926535897932384626433832795
#define INF 9223372036854775807LL
#define hashA 1257958787
#define hashB 1539500609
#define endl "\n"

string guess_sequence(int n) {
	char st;
	vector<char> chs;
	if(press("AB")) {
		if(press("A")) {
			st = 'A';
			chs = {'B','X','Y'};
		} else {
			st = 'B';
			chs = {'A','X','Y'};
		}
	} else {
		if(press("X")) {
			st = 'X';
			chs = {'A','B','Y'};
		} else {
			st = 'Y';
			chs = {'A','B','X'};
		}
	}
	string currs = "";
	currs+= st;
	for(int i = 2; i < n; i++) {
		string ask = currs;
		ask+= chs[0];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[0];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[1];
		ask+= currs;
		ask+= chs[1];
		ask+= chs[2];
		int x = press(ask);
		if(x == i-1) {
			currs+= chs[2];
		} else if(x == i) {
			currs+= chs[0];
		} else {
			currs+= chs[1];
		}
	}
	if(currs.length() < n-1) {
		while(true) {}
	}
	string ask = currs;
	ask+= chs[0];
	if(press(ask) == n) {
		currs+= chs[0];
	} else {
		string askk = currs;
		askk+= chs[1];
		if(press(askk) == n) {
			currs+= chs[1];
		} else {
			currs+= chs[2];
		}
	}
	return currs;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:58:20: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   58 |  if(currs.length() < n-1) {
      |     ~~~~~~~~~~~~~~~^~~~~

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