제출 #1168079

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1168079		Faisal_Saqib	Walk (POI13_spa)	C++17	25 / 100	5048 ms	191736 KiB

spa

#include <bitset>
#include <iostream>
#include <map>
#include <queue>
using namespace std;
#define ll long long
int n,k;
char c;
ll asp=0;
// 10000000040
bitset<1000000000> ban[2];
ll read()
{
    asp=0;
    for(int i=0;i<n;i++)
    {
        cin>>c;
        asp<<=1;
        asp+=c-'0';
    }
    return asp;
}
int main()
{
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin>>n>>k;
    ll st=read(),ed=read();
    for(int i=0;i<k;i++)
    {
        ll c=read();
        ban[0][c]=ban[1][c]=1;
    }
    // lets do a double sided bfs
    // better time complexity
    queue<pair<ll,char>>pq;
    ban[0][st]=1;
    pq.push({st,'0'});
    ban[1][ed]=1;
    pq.push({ed,'1'});
    ll op=0;
    while(pq.size())
    {
        auto xa=pq.front();
        pq.pop();
        op++;
        ll x=xa.first;
        if(ban[0][x]&ban[1][x])
        {
            cout<<"TAK"<<endl;
            return 0;
        }
        int vis=(xa.second-'0');
        // if(op*n >= 2e9)
        // {
        //     break;
        // }
        ll pw=1;
        for(int bi=0;bi<n;bi++)
        {
            ll y=x^pw;
            if(!ban[vis][y])
            {
                if(ban[1-vis][y])
                {
                    cout<<"TAK"<<endl;
                    return 0;
                }
                ban[vis][y]=1;
                pq.push({y,'0'+vis});
            }
            pw<<=1;
        }
    }
    cout<<"NIE"<<endl;
    return 0;
}

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