Submission #528646

#	Time	Username	Problem	Language	Result	Execution time	Memory
528646		rayfish	Combo (IOI18_combo)	C++17	30 / 100	48 ms	668 KiB

combo

#include <climits>
#include <iostream>
#include <algorithm>
#include <cmath>
#include <deque>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_set>
#include <unordered_map>
#include <utility>
#include <vector>

#include "combo.h"

using namespace std;
using ll = long long;

//int press(string s) {
//    return 0;
//}
string guess_sequence(int N) {
    string cur;
    char letters[] {'A', 'B', 'X', 'Y'};
    // find first letter
    for (int t_i = 0; t_i < 3; t_i++) {
        if (press(cur + letters[t_i]) == 1) {
            cur += letters[t_i];
            break;
        }
    }
    if (cur.length() == 0) {
        cur += letters[3];
    }
    // find next letters
    for (int i = 1; i < N; i++) {
        int num_c = 0;
        int t_i = 0;
        for (; num_c < 2; t_i++) {
            if (cur[0] == letters[t_i])
                continue;
            if (press(cur + letters[t_i]) == i+1) {
                cur += letters[t_i];
                break;
            } else {
                num_c++;
            }
        }
        if (cur.length() == i) {
            if (t_i == 3) {
                cur += letters[3];
            } else {
                cur += (cur[0] == letters[2] ? letters[3] : letters[2]);
            }
        }
    }
    return cur;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:52:26: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |         if (cur.length() == i) {
      |             ~~~~~~~~~~~~~^~~~

• Subtask 1: 5 / 5
• Subtask 2: 25 / 95