Submission #339554

#	Time	Username	Problem	Language	Result	Execution time	Memory
339554		Alex_tz307	Walk (POI13_spa)	C++17	100 / 100	3644 ms	54172 KiB

spa

#include <bits/stdc++.h>

using namespace std;
using ll = long long;

int N, K;
ll x, y;
unordered_set<ll> forbidden;

bool graphSearch(ll s, ll d, int cnt) {
    unordered_set<ll> vis;
    queue<ll> Q;
    Q.emplace(s);
    vis.insert(s);
    --cnt;
    while(!Q.empty()) {
        ll v = Q.front();
        Q.pop();
        for(int i = 0; i < N; ++i) {
            ll next = v ^ (1LL << i);
            if(next == d)
                return true;
            if(!forbidden.count(next) && !vis.count(next)) {
                --cnt;
                if(cnt == 0)
                    return true;
                Q.emplace(next);
                vis.insert(next);
            }
        }
    }
    return false;
}

bool solve(ll s, ll d) {
    int bound = 1e6;
    bool a = graphSearch(s, d, bound),
         b = graphSearch(d, s, bound);
    return a && b;
}

ll readBin() {
    string s;
    cin >> s;
    ll nr = 0;
    for(int i = N - 1; i >= 0; --i)
        if(s[i] == '1')
            nr += (1LL << (N - i - 1));
    return nr;
}

void read() {
    cin >> N >> K;
    x = readBin(), y = readBin();
    for(int i = 0; i < K; ++i) {
        ll a;
        a = readBin();
        forbidden.insert(a);
    }
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    cout.tie(nullptr);
    read();
    if(solve(x, y))
        cout << "TAK";
    else
        cout << "NIE";
}

• Subtask 1: 12 / 12
• Subtask 2: 12 / 12
• Subtask 3: 12 / 12
• Subtask 4: 12 / 12
• Subtask 5: 13 / 13
• Subtask 6: 13 / 13
• Subtask 7: 13 / 13
• Subtask 8: 13 / 13