Submission #112298

#	Time	Username	Problem	Language	Result	Execution time	Memory
112298		socho	Combo (IOI18_combo)	C++14	5 / 100	2 ms	244 KiB

combo

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

string guess_sequence(int N) {
    // return!
    string anchor;
    int ab = press("AB");
    int oa = -1;
    int ox = -1;
    string rem;
    if (ab > 0) {
        // must be A or B anchor
        oa = press("A");
        if (oa > 0) {
            anchor = "A";
            rem = "BXY";
        }
        else {
            anchor = "B";
            rem = "AXY";
        }
    }
    else {
        // must be X or Y anchor
        ox = press("X");
        if (ox > 0) {
            anchor = "X";
            rem = "ABY";
        }
        else {
            anchor = "Y";
            rem = "ABX";
        }
    }
    // cout << anchor;
    string pref = anchor;
    for (int i=1; i<N-1; i++) {
        string query =    pref + rem[0] 
                    + pref + rem[1] + rem[2] 
                    + pref + rem[1] + rem[0]
                    + pref + rem[1] + rem[1];
        //cout << "pres: " << query << endl;
        int response = press(query);
        //cout << " > got: " << response << endl;
        if (response == pref.length()) {
            pref += rem[2];
        }
        else if (response == pref.length() + 1) {
            pref += rem[0];
        }
        else {
            pref += rem[1];
        }
    }
    //cout << "give: " << pref << endl;
    string ender = pref + rem[0] + pref + rem[1];
    int res = press(ender);
    if (res == pref.size()) {
        pref += rem[2];
    }
    else {
        string ender2 = pref + rem[0];
        int resp = press(ender2);
        if (resp == pref.size()) {
            pref += rem[1];
        }
        else {
            pref += rem[0];
        }
    }
    return pref;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:46:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |         if (response == pref.length()) {
      |             ~~~~~~~~~^~~~~~~~~~~~~~~~
combo.cpp:49:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         else if (response == pref.length() + 1) {
      |                  ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~
combo.cpp:59:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |     if (res == pref.size()) {
      |         ~~~~^~~~~~~~~~~~~~
combo.cpp:65:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |         if (resp == pref.size()) {
      |             ~~~~~^~~~~~~~~~~~~~

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