Submission #726547

#	Time	Username	Problem	Language	Result	Execution time	Memory
726547		horiseun	Combo (IOI18_combo)	C++11	5 / 100	1 ms	280 KiB

combo

#include "combo.h"
#include <vector>
#include <cstring>
using namespace std;

string guess_sequence(int n) {
    vector<char> letters = {'A', 'B', 'X', 'Y'};
    string ans = "";
    for (int i = 0; i < 4; i++) {
        ans += letters[i];
        if (press(ans) > 0) {
            letters.erase(letters.begin() + i);
            break;
        }
        ans.pop_back();
    }

    while (ans.length() <= n - 2) {
        string gs = ans + letters[0] + ans + letters[1] + letters[0] + ans + letters[1] + letters[1] + ans + letters[1] + letters[2];
        int temp = press(gs);
        if (temp == ans.size() + 1) {
            ans += letters[0];
        } else if (temp == ans.size() + 2) {
            ans += letters[1];
        } else {
            ans += letters[2];
        }
    }

    for (int i = 0; i < 3; i++) {
        ans += letters[i];
        if (press(ans) == n) {
            break;
        }
        ans.pop_back();
    }
    
    return ans;

}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:18:25: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   18 |     while (ans.length() <= n - 2) {
      |            ~~~~~~~~~~~~~^~~~~~~~
combo.cpp:21:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |         if (temp == ans.size() + 1) {
      |             ~~~~~^~~~~~~~~~~~~~~~~
combo.cpp:23:25: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |         } else if (temp == ans.size() + 2) {
      |                    ~~~~~^~~~~~~~~~~~~~~~~

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