Submission #595117

#	Time	Username	Problem	Language	Result	Execution time	Memory
595117		thezomb1e	Combo (IOI18_combo)	C++17	30 / 100	46 ms	584 KiB

combo

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

#define eb emplace_back
#define pb push_back
#define ft first
#define sd second
#define pi pair<int, int>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define dbg(...) dbg_out(__VA_ARGS__)

using ll = long long;
using ld = long double;
using namespace std;
using namespace __gnu_pbds;

//Constants
const ll INF = 5 * 1e18;
const int IINF = 2 * 1e9;
const ll MOD = 1e9 + 7;
// const ll MOD = 998244353;
const ll dx[4] = {1, 0, -1, 0}, dy[4] = {0, 1, 0, -1};
const ld PI = 3.14159265359;

//Templates
template<typename A, typename B> ostream& operator<<(ostream &os, const pair<A, B> &p) {return os << '(' << p.first << ", " << p.second << ')';}
template<typename T_container, typename T = typename enable_if<!is_same<T_container, string>::value, typename T_container::value_type>::type> ostream& operator<<(ostream &os, const T_container &v) {os << '['; string sep; for (const T &x : v) os << sep << x, sep = ", "; return os << ']';}
void dbg_out() {cerr << endl;}
template<typename Head, typename... Tail> void dbg_out(Head H, Tail... T) { cerr << H << ' '; dbg_out(T...); }
template<typename T> void mins(T& x, T y) {x = min(x, y);}
template<typename T> void maxs(T& x, T y) {x = max(x, y);}
template<typename T> using oset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T> using omset = tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>;

const string ABC = "ABXY";
string nABC;

string guess_sequence(int n) {
    string ans;
    int skip;
    {
        string cur;
        for (int i = 0; i < 4; i++) {
            cur += ABC[i];
        }
        if (press(cur.substr(0, 2))) {
            if (press(cur.substr(0, 1))) {
                skip = 0;
            } else {
                skip = 1;
            }
        } else {
            if (press(cur.substr(2, 1))) {
                skip = 2;
            } else {
                skip = 3;
            }
        }
        ans.pb(ABC[skip]);
    }
    for (int i = 0; i < 4; i++) {
        if (i == skip) continue;
        nABC.pb(ABC[i]);
    }
    for (int it = 2; it <= n; it++) {
        string cur;
        int sz = ans.size();
        for (int i = 0; i < 3; i++) {
            cur += ans;
            cur += nABC[i];
        }
        if (press(cur.substr(0, 2 * (sz + 1))) == it) {
            if (press(cur.substr(0, sz + 1)) == it) {
                ans.pb(nABC[0]);
            } else {
                ans.pb(nABC[1]);
            }
        } else {
            ans.pb(nABC[2]);
        }
    }
    return ans;
}

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