Submission #834106

#	Time	Username	Problem	Language	Result	Execution time	Memory
834106		EntityPlantt	Combo (IOI18_combo)	C++14	30 / 100	39 ms	452 KiB

combo

#include "combo.h"
using namespace std;
inline void checkFor(string &s, char a, char b, char c) {
    int r = press(s + a + s + b);
    if (s.size() + 1 == r) {
        if (press(s + a) == s.size() + 1) s += a;
        else s += b;
    }
    else if (s.size() == r) s += c;
    else {
        s += a + s.substr(0, r - s.size() - 1);
    }
}
string guess_sequence(int n) {
    string s;
    if (press("A")) s = "A";
    else if (press("B")) s = "B";
    else if (press("X")) s = "X";
    else s = "Y";
    while (s.size() < n) {
        if (s[0] == 'A') checkFor(s, 'B', 'X', 'Y');
        else if (s[0] == 'B') checkFor(s, 'A', 'X', 'Y');
        else if (s[0] == 'X') checkFor(s, 'A', 'B', 'Y');
        else if (s[0] == 'Y') checkFor(s, 'A', 'B', 'X');
    }
    return s;
}

Compilation message (stderr)

combo.cpp: In function 'void checkFor(std::string&, char, char, char)':
combo.cpp:5:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    5 |     if (s.size() + 1 == r) {
      |         ~~~~~~~~~~~~~^~~~
combo.cpp:6:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    6 |         if (press(s + a) == s.size() + 1) s += a;
      |             ~~~~~~~~~~~~~^~~~~~~~~~~~~~~
combo.cpp:9:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    9 |     else if (s.size() == r) s += c;
      |              ~~~~~~~~~^~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:20:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   20 |     while (s.size() < n) {
      |            ~~~~~~~~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95