Submission #162496

#	Time	Username	Problem	Language	Result	Execution time	Memory
162496		abacaba	Combo (IOI18_combo)	C++14	97 / 100	52 ms	596 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) {
    srand(time(NULL));
    vector <pair <string, int> > cur_seq = {{"A", 0}, {"B", 1}, {"X", 2}, {"Y", 3}};
    random_shuffle(cur_seq.begin(), cur_seq.end());
    let1 = cur_seq[3].second;
    for(int i = 0; i < 3; ++i)
        if(press(cur_seq[i].first)) {
            let1 = cur_seq[i].second;
            break;
        }
    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];
    }

    vector <string> cur = {seq[0], seq[1], seq[2]};
    random_shuffle(cur.begin(), cur.end());
    for(int i = 0; i < 2; ++i)
        if(press(s + cur[i]) == N)
            return s + cur[i];
    return s + cur[2];
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:47:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |         if(p == s.size())
      |            ~~^~~~~~~~~~~
combo.cpp:49:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         else if(p == s.size() + 1)
      |                 ~~^~~~~~~~~~~~~~~

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