Submission #740217

#	Time	Username	Problem	Language	Result	Execution time	Memory
740217		GrindMachine	콤보 (IOI18_combo)	C++17	30 / 100	49 ms	556 KiB

combo

// Om Namah Shivaya

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x, y) ((x + y - 1) / (y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i, n) for(int i = 0; i < n; ++i)
#define rep1(i, n) for(int i = 1; i <= n; ++i)
#define rev(i, s, e) for(int i = s; i >= e; --i)
#define trav(i, a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a, b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a, b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "combo.h"

string guess_sequence(int n) {
    string chars = "ABXY";
    string curr = "";
    char first = '?';

    rep(j, 3) {
        curr.pb(chars[j]);
        if (press(curr) == 1) {
            first = chars[j];
            break;
        }
        curr.pop_back();
    }

    if (first == '?') {
        first = chars.back();
        curr.pb(first);
    }

    chars.erase(find(all(chars), first));

    while (sz(curr) < n) {
        char ch = '?';

        rep(j, 2) {
            curr.pb(chars[j]);
            int len = press(curr);

            if (len == sz(curr)) {
                ch = chars[j];
                break;
            }

            curr.pop_back();
        }

        if (ch == '?') {
            curr.pb(chars.back());
        }
    }

    return curr;
}

Compilation message (stderr)

combo.cpp: In function 'std::string guess_sequence(int)':
combo.cpp:85:21: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   85 |     while (sz(curr) < n) {
      |                     ^
combo.cpp:92:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   92 |             if (len == sz(curr)) {
      |                     ^

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