Submission #827417

#	Time	Username	Problem	Language	Result	Execution time	Memory
827417		AlesL0	Combo (IOI18_combo)	C++17	100 / 100	23 ms	560 KiB

combo

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

using namespace std;

string guess_sequence(int N){
    vector <char> c = {'A', 'B', 'X', 'Y'};
    string S = "";
    if (press("AB") > 0){
        if (press("A") > 0){
            S = "A";
            c.erase(c.begin());
        }
        else {
            S = "B";
            c.erase(c.begin()+1);
        }
    }
    else {
        if (press("X") > 0){
            S = "X";
            c.erase(c.begin()+2);
        }
        else {
            S = "Y";
            c.erase(c.begin()+3);
        }
    }
    //cerr << S << "\n";
    if (S.size() == N)return S;
    for (int i = 1; i < N-1; i++){
        string T = S+c[0]+S+c[1]+c[0]+S+c[1]+c[1]+S+c[1]+c[2];
        //cerr << T << "\n";
        int x = press(T);
        if (x == S.size())S += c[2];
        if (x == S.size()+1)S += c[0];
        if (x == S.size()+2)S += c[1];
        //cerr << S << "\n";
    }
    string T = S+c[0]+S+c[1];
    if (press(T) > S.size()){
        T = S+c[0];
        if (press(T) > S.size())S += c[0];
        else S += c[1];
    }
    else S += c[2];
    //cerr << S << "\n";
    return S;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:30:18: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   30 |     if (S.size() == N)return S;
      |         ~~~~~~~~~^~~~
combo.cpp:35:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         if (x == S.size())S += c[2];
      |             ~~^~~~~~~~~~~
combo.cpp:36:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |         if (x == S.size()+1)S += c[0];
      |             ~~^~~~~~~~~~~~~
combo.cpp:37:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (x == S.size()+2)S += c[1];
      |             ~~^~~~~~~~~~~~~
combo.cpp:41:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |     if (press(T) > S.size()){
      |         ~~~~~~~~~^~~~~~~~~~
combo.cpp:43:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   43 |         if (press(T) > S.size())S += c[0];
      |             ~~~~~~~~~^~~~~~~~~~

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