Submission #834175

#	Time	Username	Problem	Language	Result	Execution time	Memory
834175		EntityPlantt	Combo (IOI18_combo)	C++14	0 / 100	0 ms	208 KiB

combo

#include "combo.h"
using namespace std;
// Makes 2 calls & adds on average 2 letters
inline void checkFor(string &s, char a, char b, char c) {
    int r = press(s + a + a + s + a + b + s + b + a), r2;
    if (s.size() + 1 == r) {
        r2 = press(s + b + b);
        if (r2 == s.size() + 1) s = s + b + c;
        else if (r2 == s.size()) s = s + a + c;
        else s = s + b + b;
    }
    else if (s.size() == r) s += c;
    else {
        r2 = press(s + a + a);
        if (r2 == s.size()) s = s + b + a;
        else if (r2 == s.size() + 1) s = s + a + b;
        else s = s + a + a;
    }
}
// Should make N+2 calls
string guess_sequence(int n) {
    string s;
    // Should make 2 calls
    if (press("AB")) { // 1st call
        if (press("A")) s = "A"; // 2nd call
        else s = "B";
    }
    else if (press("X")) s = "X"; // 2nd call
    else s = "Y";
    // Should make N calls
    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:6:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
    6 |     if (s.size() + 1 == r) {
      |         ~~~~~~~~~~~~~^~~~
combo.cpp:8:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    8 |         if (r2 == s.size() + 1) s = s + b + c;
      |             ~~~^~~~~~~~~~~~~~~
combo.cpp:9:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |         else if (r2 == s.size()) s = s + a + c;
      |                  ~~~^~~~~~~~~~~
combo.cpp:12:23: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   12 |     else if (s.size() == r) s += c;
      |              ~~~~~~~~~^~~~
combo.cpp:15:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   15 |         if (r2 == s.size()) s = s + b + a;
      |             ~~~^~~~~~~~~~~
combo.cpp:16:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   16 |         else if (r2 == s.size() + 1) s = s + a + b;
      |                  ~~~^~~~~~~~~~~~~~~
combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:31:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   31 |     while (s.size() < n) {
      |            ~~~~~~~~~^~~

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