Submission #296991

#	Time	Username	Problem	Language	Result	Execution time	Memory
296991		Touubs	Combo (IOI18_combo)	C++17	97 / 100	34 ms	508 KiB

combo

#include "combo.h"

using namespace std;

string keys;
char initKey;

std::string guess_sequence(int N) {
    if (press("A")) {
	keys = "BXY";
	initKey = 'A';
    } else if (press("B")) {
	keys = "AXY";
	initKey = 'B';
    } else if (press("X")) {
	keys = "ABY";
	initKey = 'X';
    } else {
	keys = "ABX";
	initKey = 'Y';
    }

    string sol = {initKey};

    for (int i = 1; i < N-1; i++) {
	string q;
	q += sol;
	q += {keys[0]};
	for (char ot : keys) {
	    q += sol;
	    q += {keys[1], ot};
	}
	int res = press(q);
	if (res == sol.size() + 1) sol.push_back(keys[0]);
	else if (res == sol.size() + 2) sol.push_back(keys[1]);
	else sol.push_back(keys[2]);
    }
    if (N > 1) {
	if (press(sol + (string(1, keys[0]))) == N) sol.push_back(keys[0]);
	else if (press(sol + string(1, keys[1])) == N) sol.push_back(keys[1]);
	else sol.push_back(keys[2]);
    }
    return sol;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:34:10: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |  if (res == sol.size() + 1) sol.push_back(keys[0]);
      |      ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:35:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |  else if (res == sol.size() + 2) sol.push_back(keys[1]);
      |           ~~~~^~~~~~~~~~~~~~~~~

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