Submission #900138

#	Time	Username	Problem	Language	Result	Execution time	Memory
900138		Omar_Elgedawy	Combo (IOI18_combo)	C++17	97 / 100	15 ms	1968 KiB

combo

#include "combo.h"
#include <bits/stdc++.h>

using namespace std;
mt19937 mt(time(nullptr));

string guess_sequence(int n) {
    vector<char> chr(3);
    string cur;
    if (press("A"))chr = {'B', 'X', 'Y'}, cur = "A";
    else if (press("B"))chr = {'A', 'X', 'Y'}, cur = "B";
    else if (press("X"))chr = {'A', 'B', 'Y'}, cur = "X";
    else chr = {'A', 'X', 'B'}, cur = "Y";
    for (int i = 1; i < n-1; i++) {
//        cout<<cur+chr[0]+chr[0]+cur+chr[0]+chr[1]+cur+chr[0]+chr[2]+cur+chr[1]<<endl;
        int len=press(cur+chr[0]+chr[0]+cur+chr[0]+chr[1]+cur+chr[0]+chr[2]+cur+chr[1]);
        if(len==cur.size())cur+=chr[2];
        else if(len==cur.size()+2)cur+=chr[0];
        else cur+=chr[1];
    }
    if(n>1){
        if(press(cur+chr[0])==cur.size()+1)cur+=chr[0];
        else if(press(cur+chr[1])==cur.size()+1)cur+=chr[1];
        else cur+=chr[2];
    }
//    cout<<cur<<endl;
    return cur;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:17:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |         if(len==cur.size())cur+=chr[2];
      |            ~~~^~~~~~~~~~~~
combo.cpp:18:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   18 |         else if(len==cur.size()+2)cur+=chr[0];
      |                 ~~~^~~~~~~~~~~~~~
combo.cpp:22:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |         if(press(cur+chr[0])==cur.size()+1)cur+=chr[0];
      |            ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
combo.cpp:23:34: 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(press(cur+chr[1])==cur.size()+1)cur+=chr[1];
      |                 ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~

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