Submission #162501

#	Time	Username	Problem	Language	Result	Execution time	Memory
162501		abacaba	Combo (IOI18_combo)	C++14	100 / 100	55 ms	648 KiB

combo

#include <iostream>
#include <string>
#include <unordered_map>
#include <cstring>
#include <chrono>
#include <vector>
#include <map>
#include <random>
#include <set>
#include <algorithm>
#include <math.h>
#include <cstdio>
#include <stdio.h>
#include <assert.h>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <deque>
#include <cassert>
#include <stack>
#include "combo.h"
using namespace std;

string seq[4] = {"A", "B", "X", "Y"};
int n, let1 = 3;


string guess_sequence(int N) {
    int a = press(seq[0] + seq[1]);
    int b = press(seq[1] + seq[2]);
    if(!a && !b)
        let1 = 3;
    else if(a && b)
        let1 = 1;
    else if(a && !b)
        let1 = 0;
    else
        let1 = 2;
    string s = seq[let1];
    swap(seq[3], seq[let1]);
    if(N == 1)
        return s;
    for(int i = 2; i < N; ++i) {
        string now = s + seq[0];
        for(int j = 0; j < 3; ++j)
            now += s + seq[1] + seq[j];
        int p = press(now);
        if(p == s.size())
            s += seq[2];
        else if(p == s.size() + 1)
            s += seq[0];
        else
            s += seq[1];
    }
    for(int i = 0; i < 2; ++i)
        if(press(s + seq[i]) == N)
            return s + seq[i];
    return s + seq[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:48:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   48 |         if(p == s.size())
      |            ~~^~~~~~~~~~~
combo.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |         else if(p == s.size() + 1)
      |                 ~~^~~~~~~~~~~~~~~

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