Submission #1082672

#	Time	Username	Problem	Language	Result	Execution time	Memory
1082672		KasymK	Combo (IOI18_combo)	C++17	97 / 100	24 ms	1928 KiB

combo

#include "bits/stdc++.h"
#include "combo.h"
using namespace std;
#define ff first
#define ss second   
#define all(v) v.begin(), v.end()
#define ll long long
#define pb push_back
#define pii pair<int, int>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define tr(i, c) for(auto i = c.begin(); i != c.end(); ++i)
#define wr puts("----------------")
template<class T>bool umin(T& a,T b){if(a>b){a=b;return 1;}return 0;}
template<class T>bool umax(T& a,T b){if(a<b){a=b;return 1;}return 0;}

string guess_sequence(int n){
    string ans = "";
    if(n == 1){
        if(press("A"))
            ans += "A";
        else if(press("B"))
            ans += "B";
        else if(press("X"))
            ans += "X";
        else
            ans += "Y";
        return ans;
    }
    int x = 0;
    x = press("A");
    if(x){
        ans = "A";
        for(int i = 2; i < n; ++i){
            int s = (int)ans.size();
            x = press(ans+"X"+ans+"BX"+ans+"BB"+ans+"BY");
            if(x == s+1)
                ans += "X"; 
            else if(x == s+2)
                ans += "B";
            else
                ans += "Y";
        }
        if(press(ans+"B") == n)
            ans += "B";
        else if(press(ans+"X") == n)
            ans += "X";
        else
            ans += "Y";
        return ans;
    }
    x = press("B");
    if(x){
        ans = "B";
        for(int i = 2; i < n; ++i){
            int s = (int)ans.size();
            x = press(ans+"X"+ans+"AX"+ans+"AA"+ans+"AY");
            if(x == s+1)
                ans += "X";
            else if(x == s+2)
                ans += "A";
            else
                ans += "Y";
        }
        if(press(ans+"A") == n)
            ans += "A";
        else if(press(ans+"X") == n)
            ans += "X";
        else
            ans += "Y";
        return ans;
    }
    x = press("X");
    if(x){
        ans = "X";
        for(int i = 2; i < n; ++i){
            int s = (int)ans.size();
            x = press(ans+"A"+ans+"BA"+ans+"BB"+ans+"BY");
            if(x == s+1)
                ans += "A";
            else if(x == s+2)
                ans += "B";
            else
                ans += "Y";
        }
        if(press(ans+"A") == n)
            ans += "A";
        else if(press(ans+"B") == n)
            ans += "B";
        else
            ans += "Y";
        return ans;
    }
    // s[0] = 'Y'
    ans = "Y";
    for(int i = 2; i < n; ++i){
        int s = (int)ans.size();
        x = press(ans+"A"+ans+"BA"+ans+"BB"+ans+"BX");
        if(x == s+1)
            ans += "A";
        else if(x == s+2)
            ans += "B";
        else
            ans += "X";
    }
    if(press(ans+"B") == n)
        ans += "B";
    else if(press(ans+"X") == n)
        ans += "X";
    else
        ans += "A";
    return ans;
}

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