Submission #147663

#	Time	Username	Problem	Language	Result	Execution time	Memory
147663		xDWaffle	Ljetopica (COI19_ljetopica)	C++11	0 / 100	2 ms	376 KiB

ljetopica

#include <bits/stdc++.h>
#define ff(j, a, b) for(long long j=a;j<b;j++)
#define pb push_back;
#define MOD 1000000007

using namespace std;

typedef long long ll;

ll n, k;
ll a, b, path;



void load_path()
{
    path=1;
    ff(j, 0, n-1)
    {
        char tmp;
        cin >> tmp;
        path=path*2;
        if(tmp=='R')
        {
            path++;
        }
        path=path%MOD;
    }
}

ll bin_string_to_ll(string s)
{

    ll res=0;
    ff(j, 0, (ll)s.size())
    {
       res=res*2;
       if(s[j]=='1')
       {
            res++;
       }
       res=res%MOD;
    }
    return res;
}


ll switch_at_depth_q(ll q, ll pathing)
{
    return ((1 << (n-q) )-1) ^ pathing;
}


ll check_pathing(ll x)
{
    return (x<=b && x>=a) ? x : 0;
}


ll ena_je_budala_neopjevana(ll switches, ll depth, ll pathing)
{
    if(switches==n-depth && switches>0)
    {
        return (ena_je_budala_neopjevana(switches-1, depth+1, switch_at_depth_q(depth, pathing)))%MOD;
    }
    if(depth==1)
    {
        ll sol=ena_je_budala_neopjevana(switches, depth+1, pathing);
        sol+=ena_je_budala_neopjevana(switches, depth+1, switch_at_depth_q(depth, pathing));
        if(switches>0)
        {
            sol+=ena_je_budala_neopjevana(switches-1, depth+1, pathing);
            sol+=ena_je_budala_neopjevana(switches-1, depth+1, switch_at_depth_q(depth, pathing));
        }
        return sol%MOD;
    }
    if(switches==0)
    {
        return check_pathing(pathing)%MOD;
    }

    return (ena_je_budala_neopjevana(switches, depth+1, pathing) + ena_je_budala_neopjevana(switches-1, depth+1, switch_at_depth_q(depth, pathing)))%MOD;

}

int main()
{
    cin >> n >> k;
    load_path();
    string tmpstrng;
    cin >> tmpstrng;
    a=bin_string_to_ll(tmpstrng);
    cin >> tmpstrng;
    b=bin_string_to_ll(tmpstrng);
    ///zavrseno ucitavanje!!

    /// XOR <=> ^

   ///cout << (int)ena_je_budala_neopjevana(k, 1, path) << endl;
    cout << (a%MOD+b%MOD)%MOD;
    return 0;
}

• Subtask 1: 0 / 8
• Subtask 2: 0 / 14
• Subtask 3: 0 / 17
• Subtask 4: 0 / 61