Submission #728991

#	Time	Username	Problem	Language	Result	Execution time	Memory
728991		Toxtaq	Combo (IOI18_combo)	C++17	100 / 100	39 ms	588 KiB

combo

#include <bits/stdc++.h>
using namespace std;
int press(std::string p);

std::string guess_sequence(int N){
    int n = N;
    string res = "", s;
    if(press("AB")){
        if(press("A")){
            res += 'A';
            s = "BXY";
        }
        else{
            res += 'B';
            s = "AXY";
        }
    }
    else{
        if(press("X")){
            res += 'X';
            s = "ABY";
        }
        else{
            res += 'Y';
            s = "ABX";
        }
    }
    for(int i = 1;i < n - 1;++i){
        string d = res;
        d += s[0];
        d += res;
        d += s[1];
        d += s[0];
        d += res;
        d += s[1];
        d += s[1];
        d += res;
        d += s[1];
        d += s[2];
        int num = press(d);
        if(num == res.size() + 1){
            res += s[0];
        }
        else if(num == res.size() + 2){
            res += s[1];
        }
        else{
            res += s[2];
        }
    }
    if(res.size() == n)return res;
    string d = res;
    d += s[0];
    if(press(d) == n){
        return d;
    }
    d.pop_back();
    d += s[1];
    if(press(d) == n){
        return d;
    }
    d.pop_back();
    d += s[2];
    return d;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:41:16: 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(num == res.size() + 1){
      |            ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:44:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |         else if(num == res.size() + 2){
      |                 ~~~~^~~~~~~~~~~~~~~~~
combo.cpp:51:19: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   51 |     if(res.size() == n)return res;
      |        ~~~~~~~~~~~^~~~

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