Submission #597297

#	Time	Username	Problem	Language	Result	Execution time	Memory
597297		Abdulmohsen1284	Combo (IOI18_combo)	C++14	100 / 100	40 ms	520 KiB

combo

#include"bits/stdc++.h"
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class x>
using ordered_set = tree<x, null_type,less<x>, rb_tree_tag,tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void usaco(){freopen("cruise.out","w",stdout);freopen("cruise.in","r",stdin);}
long long a[2000005],c[2000005];

#include "combo.h"

std::string guess_sequence(int N) {
    int n=N;
    string ans;
    string fr="AB",sc="XY";
    set <char> h;
    h.insert('A');
    h.insert('X');
    h.insert('B');
    h.insert('Y');
    int coin = press(fr);
    if(coin>0)
    {
        fr="A";
        coin = press(fr);
        if(coin>0)
        {
            h.erase('A');
            ans+="A";
        }
        else
        {
            h.erase('B');
            ans+="B";
        }
    }
    else
    {
        sc="X";
        coin = press(sc);
        if(coin>0)
        {
            h.erase('X');
            ans+="X";
        }
        else
        {
            h.erase('Y');
            ans+="Y";
        }
    }
    if(n==1)
        return ans;
    vector <char> v;
    for(auto i : h)
        v.push_back(i);
    long long bef=1;
    for(int i=1;i<N-1;i++)
    {
        bef=i;
        string cur = ans+v[0]+ans+v[1]+v[0]+ans+v[1]+v[1]+ans+v[1]+v[2];
        int bruh = press(cur);
        if(bruh==bef)
        {
            ans+=v[2];
        }
        else if(bruh==bef+1)
        {
            ans+=v[0];
        }
        else
            ans+=v[1];
    }
    fr=ans+v[0]+ans+v[1];
    int bruh = press(fr);
    if(bruh==n)
    {
        fr=ans+v[0];
        bruh = press(fr);
        if(bruh==n)
            ans+=v[0];
        else
            ans+=v[1];
    }
    else
        ans+=v[2];
    return ans;
}

/*
int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
}*/

Compilation message (stderr)

combo.cpp: In function 'void usaco()':
combo.cpp:9:21: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | void usaco(){freopen("cruise.out","w",stdout);freopen("cruise.in","r",stdin);}
      |              ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
combo.cpp:9:54: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    9 | void usaco(){freopen("cruise.out","w",stdout);freopen("cruise.in","r",stdin);}
      |                                               ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~

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