Submission #578409

#	Time	Username	Problem	Language	Result	Execution time	Memory
578409		1zaid1	Combo (IOI18_combo)	C++14	100 / 100	38 ms	588 KiB

combo

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

string guess_sequence(int n) {
    string s = "";
    set<char> st = {'A', 'B', 'X', 'Y'};
    if (press("AB") > 0) {
        if (press("A")) {
            s += "A";
            st.erase('A');
        } else {
            s += "B";
            st.erase('B');
        }
    } else {
        if (press("X")) {
            s += "X";
            st.erase('X');
        } else {
            s += "Y";
            st.erase('Y');
        }
    }

    if (n == 1) return s;

    string a(1, *st.begin()), b(1, *next(st.begin())), c(1, *next(next(st.begin())));
    for (int i = 1; i < n-1; i++) {
        string p = s+a+b  + s+a+a + s+a+c + s+b;
        int x = press(p);
        if (x == s.size()+2) s += a;
        else if (x==s.size()+1) s += b;
        else s += c;
    }

    if (press(s+a + s+b) == n) {
        if (press(s+a) == n) s += a;
        else s += b;
    } else s += c;

    return s;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:32:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |         if (x == s.size()+2) s += a;
      |             ~~^~~~~~~~~~~~~
combo.cpp:33:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   33 |         else if (x==s.size()+1) s += b;
      |                  ~^~~~~~~~~~~~

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